四川省遂宁市2018-2019学年七年级上学期期中生物试卷
※题型：单选题※知识点：单选题※试题难度：中等<br>请从下面列举的四组中,选出都是生物的一组( )<br>A.太阳、细菌、水绵 B.蘑菇、青蛙、矿石<br>C.病毒、木耳、鲸 D.河水、河蚌、鹅卵石<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/14c457f0bf844663ab8658345476840e/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/dec1f3da7bda42faafe7622579f923f2/B9497B02414CB0CE96CA6DB774A87A0B.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>生物多样性不包括( )<br>A.物种的多样性 B.基因的多样性<br>C.生物数量的多样性 D.生态系统多样性<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/a1f34d8e81a54d78a07ba1bc91df6784/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/2a3688e847924175a7489278ed9c23e2/2DAC87C8B86CD302425DB6A809012D50.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>我们美丽的校园是一个生态系统,构成这个生态系统的是( )<br>A.校园里所有的花、草、树木和动物<br>B.校园里所有的生物及其生存环境<br>C.校园里所有的老师和同学<br>D.校园里宽阔的运动场<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2018/b245c90d97a640dbbb040c7c61d5bc53/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2018/a942b408a42a46fe8ee82fc1bb149cf0/9AFD9D51FD0C2CF02AEC7800CF3CCC0F.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>探究“光对鼠妇生活的影响”实验中的实验变量是( )<br>A.光照 B.湿度 C.温度 D.空气<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/ccce17baf7fd4fc9a5c0c2be0f65380d/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/077d122b50964d7aa508466f4c038cde/F4ADA136BFEE08B6887C5F0B98F2A611.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>使用显微镜时,对光的正确方法和顺序是( )<br>①转动转换器,使高倍镜对准通光孔②左眼注视目镜,右眼睁开③调节反光镜,看到白亮的视野④转动转换器,视低倍镜对准通光孔A.①②③ B.④②③ C.②④③ D.②①③<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/1e66ecaff4264b2995a363f40b312c14/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/40e7b75070644d3fb61bc2cd72e2ef88/F5BB807B10ECCD7A393DBDD0DBFA74B2.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>透明玻片上的“9>6”,用显微镜观察到的是( )<br>A.9>6 B.6<9 C.6>9 D.9<6<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2014/e5972600f8a54627a1ad9cede66eaf97/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2014/50553d86f2854c46a0c77ada67ecb331/0523BBB6F6DB66C07F96C777F8EDF93A.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>俗话说“大树底下好乘凉”“千里之堤,溃于蚁穴”。这些体现了( )<br>A.生物能影响环境<br>B.生物能适应一定环境<br>C.环境能影响生物的生存<br>D.生物因素对生物的影响<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2018/f34449e2f0464410a7f147bd58ffe1d8/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2018/0f71d675f2294b7a850f8bc48973ea67/A02E39C52B372CFBA4DAD0911192ECA8.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>制作洋葱表皮细胞临时装片的正确操作顺序是( )<img src="https://picture2.zhihuicn.com/testImage/2/2020/11/2/1AD7727BCAD68BEC93A3030D0CB685DF.png"><br>A.①②③④ B.②③④① C.④②①③ D.③④②①<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/7ee27a3585144aae956f68bf5517ce33/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/03549dcb726b497f95805b83104745b9/59D413E16FA094241538E30D5964B3AE.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列哪一组结构是植物细胞所特有的( )<br>A.细胞壁、细胞核 B.细胞膜、叶绿体<br>C.细胞质、细胞膜 D.细胞壁、叶绿体<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/dd58c4af485944cbba179bf441a8285f/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/c0a45849aeac4fe39a67203c9f5ea06b/8035ECB603E043002ED2249FB7372238.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>下列说法不是所有生物共有特征的是( )<br>A.生物都是由细胞构成的<br>B.生物都能生长、发育并繁殖后代<br>C.生物的生活需要营养<br>D.生物能进行呼吸<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/2b4204f572ff4344b2c8398eb48cc98a/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/1e276c5ab91040b9879463590a64554c/250EF71CFD751F3BC52F56C9BF351343.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>菊花原产于我国,现在世界上已有2万多个品种。菊花之所以存在这么多品种,是因为( )<br>A.菊花是多种多样的 B.菊花是形形色色的<br>C.遗传物质不同 D.生活环境不一样<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/d445d88a638e4f78ba2ad613f78ebb03/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/b8c21e913a0e4c1eb56a7399231fb2fb/8095CB124D1BEE938B7382B0F4F08AB6.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>在“响尾蛇是如何跟踪它放走的猎物”的实验方法研究中,设计一只没有被响尾蛇袭击过的死老鼠的目的是( )<br>A.起重复实验的作用<br>B.研究响尾蛇对老鼠体温的反应<br>C.研究响尾蛇对死的老鼠是否袭击<br>D.与响尾蛇袭击过的死老鼠进行对照<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/67b5f3946e2c4f7fa426a1ed450607cc/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/08cceac33a7a438f91ad590116ca4e85/CD77C711391676E8762A4473F071F5F6.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>不论是动物体或是植物体,它的结构和功能的基本单位都是( )<br>A.细胞 B.组织 C.器官 D.系统<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2014/ab3a819edba74855a9084b49c7ac8aa4/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2014/ee40a7ba4d74406cb0a42448d89675c0/FEC83E7EA7AFECE51E39DBF1B882EBC0.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>先用显微镜的10倍目镜和10倍物镜观察细胞,然后换上40倍的物镜继续观察,其结果是( )<br>A.视野变暗、细胞数目减少<br>B.视野变亮、细胞数目减少<br>C.视野变暗、细胞数目增多<br>D.视野变亮、细胞数目增多<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2014/8c510b38a69546bb95c51eb2963a6374/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2014/95c0effea1bb493fa30847954f26db81/CAE7F64FBE901853D09AF01A533FA911.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>下列生物中不属于单细胞生物的是( )<br>A.变形虫 B.玉米 C.草履虫 D.衣藻<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2015/8345068874f54cff89fd9cbb00f795df/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2015/1fe9e0f3b13e4b93852473016ba6f69d/5411072043AAB634B4FFC865FC6D3D72.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>水稻根尖分生区细胞的分裂过程排序正确的是( )<br>①细胞核一分为二,成为两个新的细胞核②新的细胞核之间的细胞质中央形成新的细胞膜,并将细胞质分成两部分③产生新的细胞壁.A.①②③ B.①③② C.②③① D.③①②<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2014/dbd473fdeb1f45ebad6f54e63a0e5d1f/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2014/7979465467e54a489ba9f2c26f77606c/3900FAA120CA7CBA0174450A55A7CA7D.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>用显微镜观察洋葱表皮细胞时,若光线太弱,应选用( )<br>A.大光圈、平面镜 B.小光圈、平面镜<br>C.大光圈、凹面镜 D.小光圈、凹面镜<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/8ba921a209724bcf87fff07fd8efe148/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/240266ecb48347c8bcb0ff0eaa5a1fac/DC3321602FC56EF137F93A779B0355BB.png"><br><br>※题型：单选题※知识点：单选题※试题难度：容易<br>一个生物体由小长大,是由于( )<br>A.细胞体积增大<br>B.细胞数量增多<br>C.细胞体积增大和细胞数量增多<br>D.细胞体积增大或细胞数量增多<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2013/2b53dd90a11a4fe58299e1e7aee1fd6e/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2013/91eae5e399b64cca89f8c9375694b309/DAA86F3E150E4DB72A5D8F18C53D37AF.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>以下是为探究温度是否影响黄栌叶色而进行的实验设计,符合要求的是( )<br>A.甲组用弱光照射,乙组用强光照射<br>B.甲组光照时间长,乙组光照时间短<br>C.甲组置于低温环境中,乙组置于高温环境中<br>D.甲组土壤保持湿润,乙组土壤保持干燥<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/bdb438dcbfce423c8ed40750a1a3f40d/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/b0ce48ca3c994f65a3057857e05f4358/351C9AB5B9571D363E51015246B66309.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>在使用显微镜时,必须对准通光孔的结构是( )<br>A.物镜光圈 B.转换器遮光器<br>C.物镜目镜 D.反光镜物镜<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/65dbcc06ffb647f497ad723c21313402/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/37b29d0da4884532b8732eb31d4e8ab4/E4990ADDF82C5B612582811E44BF5572.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>植物细胞和动物细胞都具有的能量转换器是( )<br>A.液泡 B.叶绿体 C.线粒体 D.细胞核<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/93828b0c1e02431aa9c0e60ef1b44ec4/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/874b1c4ecfea47518adc85e980876f90/36F679570FC9464A2EA72100792398C1.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>在用显微镜观察临时装片时,发现视野中有一个污点。转动目镜和移动装片时,污点不动,由此可以判断污点的位置是在物镜上。<br>_<br>_____<br>(判断对错)<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/02ed2170d4ef490889a971522b52326b/1571767E7D00EDF0367E5DB18F5CF334.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/c5ed9a6bdf884cf8986b9a13c43a8caf/1DE67A1AA8B32CAC5904B34EDDEFCC05.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>植物体只有绿色部分才有叶绿体这个结构。<br>_<br>_____<br>(判断对错)<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/7dfe3a30c52b474fbe40ed20cb6deaa9/1571767E7D00EDF0367E5DB18F5CF334.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/f9eaccf594734509ace49783773e1b45/CDEE68515AC7FE294796D0169E612A45.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>钟乳石会慢慢长大,所以钟乳石是生物。<br>_<br>_____<br>(判断对错)<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/265f6ee7c9534667bca8233cc2c90c83/1BF6542C45D8F9CAF60E902F8E776A20.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/a3da011af5d74cae862bb3f547b475d1/4534001119C64BDB966FCEF2F5ABF7FA.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>细胞分裂过程中,因为细胞核一分为二,所以新细胞只有原细胞一半的遗传物质。<br>_<br>_____<br>(判断对错)<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/b95db7b485224fd9b4e5bc80183c4526/1BF6542C45D8F9CAF60E902F8E776A20.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/543b686ec52a42c1b86e4cd0d6479916/84FC7F93D301BF067CEC492106C6C7B8.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>制作人口腔上皮细胞临时装<br>片时在<br>载玻片的中央滴的是清水,以便维持细胞的正常形态。<br>_<br>_____<br>(判断对错)<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/1899ed04641c436e87412df33ec0f22c/1BF6542C45D8F9CAF60E902F8E776A20.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/284df9f2309f4ac98837ba8dfa711240/2F3695B61E40E3CEF61C9BF0E798AA6F.png"><br><br>※题型：判断题※知识点：判断题※试题难度：中等<br>在做“影响鼠妇分布的环境因素”的实验时,用<br>只<br>鼠妇是为了<br>减小误差。<br>_<br>_____<br>(判断对错)<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/7a18a5057ae34f909a88b78ba320c812/1571767E7D00EDF0367E5DB18F5CF334.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/b87f5beb061441da900e23f622b915f2/EDC5A4BDCA27F4CF330256258EE87F20.png"><br><br>※题型：连线题※知识点：连线题※试题难度：中等<br>请将科学家与相应的研究成果用线连接起来。<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/11/2/A3B8E378AF6FD9BB2412375C3704D374.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/cf753c80226340388538450e83f32595/F5E7251DA044EB642F0B730EB8D8D0E1.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/6d4651ac38ec4c63909826af67f2cb1f/DF12C06A165198E6ADDB912A22935F02.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>生物最基本的特征是<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/58d5edf3d8144f7dbeb32e8c10322852/C4E6AB2776D0D829D9C3EF3CF5ABC5DA.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/29b520ac297f486b8cf72ab94bf5632c/8CE146873D0930AFBACFA1DDE6F25CC6.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>地球上最大的生态系统是<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/f903915b81424c978104330045d96054/8B1E1CDF0AA5ACA3B5DC1F500E3E01ED.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/66dd31c8256448cca7baa9732d0684c1/2C265839B234F31EC140C138F9A1499E.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>若在显微镜的视野中看见物像位于左上方,应将<br>玻<br>片标本向<br>移动,才能将物像移到视野正中央。<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/3828afefa8074c9db6e0d1db329b1964/83145751707D960AF6C02E357AA90617.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/934c837ecfc342bc8f615b0a7f78fe1c/C5E483FED4700B5F3AC3E7AF3E67C0A1.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>当细胞生长到一定大小时就停止生长,有些细胞可以一分为二,成为两个相似的新细胞,这就是<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/ea1c76028a654dabbc720911d9a6df02/DB5596B9F2418AB2D836A247856BD0F5.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/b2626d4f2a6b47da8c3c345d4990b8cb/26534059ADE1B984D5BCBE18490DA907.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>“螳螂捕蝉黄雀在后”是生物之间最为普遍的<br>关系。<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/9efed0b50b2d43f9850266326a6f2e65/5F6F904946ED857BA8B58918E48C3539.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/5ce479d175cd495bbe215e40123d69a7/383B3FC42028BF539801FEE39DD3F7A6.png"><br><br>※题型：读图填空题※知识点：读图填空题※试题难度：中等<br>仔细观察如图所示的植物细胞和动物细胞结构模式图,然后回答下列问题:<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/11/2/E65B265015FF92AFD75844C38128D976.jpeg"><br>1.图中能表示植物细胞结构模式图的是。<br>2.动、植物细胞共有的结构是(填序号),植物细胞特有的结构是(填序号)。<br>3.能控制物质进出的细胞结构是[]。<br>4.细胞中最重要的结构是[]。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/8df7f3803b514117a4cf79b984c25dda/696806FFE89DA29E33DF9AD7FF4AF6D7.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/37561aee050640e98561be0eab23f96d/9C21F510425A1534428FD50674F1C3FD.png"><br><br>※题型：读图填空题※知识点：读图填空题※试题难度：中等<br>根据显微镜的结构图填空。<br><img src="https://picture2.zhihuicn.com/testImage/2/2020/11/2/6CBDD34E69E46EE46AF65B9A98473A90.png"><br>1.能放大物像的结构是[]和[]。<br>2.可以将模糊的物象调得更清晰的是[]。<br>3.用来调节光线强弱的结构是[]和[]。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/8a6418e3289743b2b1997a3eb98245c2/B01906787085F9AAF9C860C534053581.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/8e4a3939da7a4c93ba808128b9d0c417/55853052127D30709F3B296A308B4342.png"><br><br>※题型：探究题※知识点：探究题※试题难度：中等<br>小李爱吃西红柿,家里的没有吃完,妈妈又给他买了一些,过了两天,他发现新买的一个西红柿腐烂了。他仔细观察了一下,腐烂的西红柿表皮有一道裂纹,其它西红柿的表皮完好无损。于是,他产生了一个疑问:西红柿的表皮是不是有保护作用呢?为了证明这个问题,他做了一个探究实验。请根据实验回答下列问题:<br>(<br>)提出问题:<br>_<br>________<br>?<br>(<br>)<br>作出<br>假设:西红柿表皮有保护作用。<br>(<br>)制定计划:<br>①取大小<br>_<br>________<br>(选择“相同”或“不同”)的<br>A<br>、<br>B<br>两个西红柿,目的是控制<br>_<br>________<br>,然后用清水冲洗干净。<br>②用小刀把<br>A<br>西红柿去掉一块表皮,<br>B<br>西红柿则保持完好,目的是进行<br>_<br>________<br>;<br>③把<br>A<br>、<br>B<br>两个西红柿都放到厨房的阳台上;<br>④过几天后,观察西红柿的变化。<br>(<br>)记录现象:<br>A<br>西红柿<br>_<br>________<br>B<br>西红柿<br>_<br>________<br>。(选择“完好”或“腐烂”)<br>(<br>)得出结论:<br>_<br>________<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2020/5e47370d6a6142bebad428859da3d609/9DF0C5ACAD9B5BFAB53482E9E9B31CEF.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2020/ea6c60547b7348898508249a72c51331/E4EC1BB96020C291ECA884E4267288D0.png"><br><br>
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