admins 发表于 2021-8-18 22:26:02

河北省保定市满城县2018-2019学年七年级上学期期中考试生物试卷

※题型:单选题※知识点:单选题※试题难度:中等<br>下列各项中都属于生物的一组是(&nbsp;&nbsp;&nbsp;)<br>A.雁翎、钟乳石&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.元鱼、松树<br>C.珊瑚、青虾&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.枯枝、芦苇<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/862a4dbe339c41a8979e071fe51717cd/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/5f836f78bd58448f99cf53dc75dfc8dd/A81311F81D476DA55BFEB22B6E1756E8.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>“更无柳絮因风起,惟有葵花向日倾”描写的生物特征是(&nbsp;&nbsp;&nbsp;)<br>A.生物的生活需要营养&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.生物能生长和繁殖<br>C.生物能对外界刺激做出反应&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.生物能进行呼吸<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/5f1779e818354111a103f590bd9ec8c4/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/3f014a93fac04231a4ac384510e0b9aa/198BD9243A220D0969410D30DF5F99C6.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>某兴趣小组想了解盘古村自然公园内柿子的种植情况,应用的科学方法是(&nbsp;&nbsp;&nbsp;)<br>A.观察法&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.调查法&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.实验法&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.测量法<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/127737b430b14f7e8074ebe2a7e956c0/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/2519d73107264fafadfba8cfccbc5eca/80778D6F024305D2CAFE4B8D34C8989E.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>结合所学的生物学知识,你认为下列归类正确的是(&nbsp;&nbsp;&nbsp;)<br>A.海带、鲫鱼、桑椹为水生生物<br>B.蟹、蝗虫、西瓜为陆生生物<br>C.小麦、玉米、水稻为作物<br>D.鹅、狗、鸭为家禽<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/8020164fab61425fa02d0ba2ce3c6c86/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/2e3fd22ca3ba4553868f3eff6f2ef72d/0ADB0294891E722B18EC97D48D876DAD.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>我省部分城市为了美化城市环境,引进大量南方苗木,但多数苗木成活率低,主要是由以下哪种生物因素导致的(&nbsp;&nbsp;&nbsp;)<br>A.温度&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.空气&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.水分&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.光照<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/b8d947bd2c7d4b5eac51176f27d64f65/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/230ec7e7a1da4530b8820cf49728324e/14B37080E1F677689B31F7FF793F502F.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>下列各项中,食物链书写正确的是(&nbsp;&nbsp;&nbsp;)<br>A.草←野兔→狼&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.草→野兔→狼<br>C.阳光→草→野兔→狼&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.草→蝗虫→细菌、真菌<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/81f3bd14653d4e09ba4948db494d7142/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/ee0aa4fca6f147068c0bbb417c1a0596/F80FAB8F8E0B290B2D7CEDE2E687D6C8.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>2018年4月22日,第49个“世界地球日”的活动主题是“珍惜自然资源,呵护美丽国土--讲好我们的地球故事”。下列不符合这一理念的是(&nbsp;&nbsp;&nbsp;)<br>A.提倡绿色出行&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.生活垃圾混在一起集中处理<br>C.人走灯灭避免长明灯&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.高效地利用能源<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/9ade6f875c5941629fc0edca819463bd/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/76d3b70628114221b066ed79c6318783/9E9E2C8F3E709152A8873A86216F7ACF.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>若用下列四台显微镜观察人口腔上皮细胞临时装片,观察到的细胞数目最少的是(&nbsp;&nbsp;&nbsp;)<br>A.目镜15×、物镜4×&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.目镜10×、物镜4×<br>C.目镜10×、物镜40×&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.目镜15×、物镜10×<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/f46e5a4cc2544fcca9cb3f23c22246bc/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/53db8f7a10f1422292169fd8e92329d0/3E25ED0F05337B1584610989541C73D9.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>用显微镜观察的材料必须是(&nbsp;&nbsp;&nbsp;)<br>A.薄而透明的&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.湿润的&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.干燥的&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.完整的<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/cc575526f8e448a498a56c1ff3413c48/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/8f20d77037a64a17865e943e15d11882/FAA60A5D5DE5CD48A1D5E6A6EEFE910F.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>显微镜观察标本时发现视野较暗,下列哪项操作可增加视野亮度(&nbsp;&nbsp;&nbsp;)<br>A.移动装片&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.调节细准焦螺旋<br>C.增大光圈&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.更换目镜<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/2876ee0240d64030a3f35c5b904f9485/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/1be47c060fcd47c0ac7c49475d550e78/B782F6B9F0E6C17E128C53B3D4792144.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>若在显微镜视野中发现有污点,污点最不可能存在的位置是(&nbsp;&nbsp;&nbsp;)<br>A.目镜&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.物镜&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.玻片&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.反光镜<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/fc3e16723b5945afb26e136494aec735/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/917f040eae184aeea42761cb285227c2/AFE173D44288EC7B8D6C49EDD5AB6844.png"><br><br>※题型:单选题※知识点:单选题※试题难度:较易<br>若在载玻片上写上英文字母“bp”,在显微镜视野里看到的物像是(&nbsp;&nbsp;&nbsp;)<br>A.qd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.bp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.pb&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.dq<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/c782a6ff93c04bcda0b47cf6b23e639c/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/885fad382a834243a0f513c91e91e5e9/4FFC1CBE73115B05025BAE39E590D15D.png"><br><br>※题型:多选题※知识点:多选题※试题难度:中等<br>下列关于使用显微镜观察口腔上皮细胞装片时,遇到的现象解释不合理的是(&nbsp;&nbsp;&nbsp;)<br>A.观察口腔上皮细胞时发现细胞重叠—材料没有涂抹均匀<br>B.观察时正确使用粗准焦螺旋,找不到物像—没有使用细准焦螺旋<br>C.物像偏视野左上方,向右下方移动装片,观察不到物像—物像已不在视野范围内<br>D.在载玻片上滴一滴清水—为了维持细胞正常的形态和生理功能<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/52e09cebd4914f0aa8d57f182e6e3c66/D18D4D13EAB1C5050787CC6EDF970E13.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/0058916b2a2144fbb47eef036485d121/5563B2440C0B9EDEFA2548AC48D73580.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>在绘制生物图时,正确的做法是(&nbsp;&nbsp;&nbsp;)<br>A.用中性笔作图<br>B.图中暗的地方涂黑<br>C.绘制的生物图形一定要和课本上的一致<br>D.在图中结构名称应标在图的右侧<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/a31c00edcf764fa492fa00fc6421be1c/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/951d0a618d2047399cf1840bcdac3c3f/700AACC328E450C5F3DD2E08577B0A87.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>有益的物质可以进入细胞而有害物质不能进入,这主要是受哪一结构的控制(&nbsp;&nbsp;&nbsp;)<br>A.液泡&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.细胞壁&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.细胞核&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.细胞膜<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/6bc1fda1464f49bba9473fcc4d5adf51/01A39E48B8A67989A23F6887F26FCC64.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/af4cfc4c4f5441b881e138b205a9fb8d/8C5666E3231C358266DAF48D8FD60B0E.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>动、植物细胞都具有的能量转换器是(&nbsp;&nbsp;&nbsp;)<br>A.线粒体&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.叶绿体<br>C.细胞核&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.线粒体和叶绿体<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/cf631e52a9e941be87532768fa27dd64/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/cc8998c367e146b08117bfd284fbb950/823D13D7A00728A0C6B400D40867A472.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>下列细胞中的物质,分子比较大,属于有机物的一类是(&nbsp;&nbsp;&nbsp;)<br>①水②无机盐③蛋白质④脂类⑤核酸⑥糖类⑦氧气A.①②③④&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.②③⑤⑥&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.③④⑤⑥&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.①④⑥⑦<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/7ff4689dea644fb7b61e6563cae5ee42/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/37a26604ec444d4fbf35522a489deeef/8948F5980F1EBB153FE91094DE79AEEA.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>2017年在中国科学院神经科学研究所先后诞生世界最早的两例体细胞克隆猴“中中”&nbsp;&nbsp;和“华华”,再次把克隆技术推向新的高度,下列关于克隆技术的叙述错误的是(&nbsp;&nbsp;&nbsp;)<br>A.克隆技术可快速繁殖良种家畜<br>B.克隆出的动物比正常动物更适应环境<br>C.克隆说明细胞核控制着生物的发育和遗传<br>D.克隆技术可以帮助拯救濒危动物<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/f9a7045a8adf46b9a123257b99ef49f6/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/91f81730842840c1a952f87ea5a0fc1b/5220D39CA829DE9971E90140C697927F.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>细胞分裂过程的正确顺序是(&nbsp;&nbsp;&nbsp;)<br>①细胞质分成两份,每份各含有一个细胞核②动物细胞从中部溢裂为两个,植物细胞在中央形成新的细胞膜和细胞壁③细胞核由一个分成两个A.③①②&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.①③②&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.③②①&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.①②③<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/c2d9d4ac82024cd6b0fa4917d2eb88ba/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/819163a8f1f74cc8807cda8c4ef6f0bb/2B2B62AACDABA2E8FC99D00ECEB84056.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>以下不属于人体四大基本组织的是(&nbsp;&nbsp;&nbsp;)<br>A.上皮组织&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.肌肉组织&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.营养组织&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.结缔组织<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/8f9c14989700472a8d9d22a0c6bdfdca/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/9b7e00b259684ad3aa424d0dbe27dd0f/8A10266E920C1803500C603C2EAD108D.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>一块完整的人体骨骼肌在结构层次上属于(&nbsp;&nbsp;&nbsp;)<br>A.组织&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;B.器官&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;C.细胞&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;D.系统<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/2a0f37dd83a848039d5d47d4ea5247ea/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/eb259abe1e29477d849552c3183aae7c/FCD373716429AB838C701D6402604D2C.png"><br><br>※题型:单选题※知识点:单选题※试题难度:中等<br>下列关于单细胞生物的叙述,错误的是(&nbsp;&nbsp;&nbsp;)<br>A.都是对人类有害的生物<br>B.整个身体由一个细胞构成<br>C.都能够独立完成生命活动<br>D.大多生活在水域或湿润环境中<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/20bc72cdf4c6443c875e0d0332da08f7/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/18529fb44c2d4ea5ab8c6a08e9b73206/04DB13DFC31A0AB1EDFBC3F04DEEAAE5.png"><br><br>※题型:填空题※知识点:填空题※试题难度:中等<br>生物学上,常用的<br>玻片根据<br>材料不同分为<br>、<br>和装片,根据保存时间可分为<br>玻<br>片和<br>玻<br>片。<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/a9d051fd3c344ba5a517599feda40650/C6DB8686EFC1A35836B08BBD48A6CE24.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/304033f7b0894c1a93bf3c9412fa4126/3515632B79DC7BB61FA2DFBAC780F55F.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>如图分别为细胞结构和显微镜结构示意图,<br>请据图<br><img src="https://picture2.zhihuicn.com/testImage/2/2019/10/18/2008944CB6BE0733195B4998904708BF.png"><br>1.制作人口腔上皮细胞临时装片时,首先在载玻片上滴加的液体是,滴加该液体的目的是,对细胞染色所用的液体是,这样做是为了。2.用显微镜观察制作好的临时装片前要对显微镜进行对光,首先转动转换器使物镜对准通光孔,然后转动[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;],选择最大光圈对准通光孔,最后,眼注视目镜转动反光镜,对光完成的标志是;安放好玻片并在镜下已经找到观察物像,如果要使物像更清晰些,应调节显微镜的[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;]。3.在显微镜下观察到的人口腔上皮细胞的结构图应该是上图中的(填甲或乙)相似。4.如果将口腔上皮细胞改为洋葱表皮细胞进行观察,则会发现洋葱表皮细胞与口腔上皮细胞在结构上的不同点有,口腔上皮细胞没有。5.山楂素有“开胃第一果”之称,吃起来酸甜可口。这些酸甜物质主要存在于细胞中的[&nbsp;&nbsp;&nbsp;&nbsp;]。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/2382af4a22344c13969707cce41fc4da/BFD0352DF4037AEDE041B1AFF358BA6F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/846783788e164a42887f83cfe1a5c95b/833D6ED2CEBB115BE4D8A475AD3B65DD.png"><br><br>※题型:探究题※知识点:探究题※试题难度:中等<br>生物体对外界刺激都能<br>作出<br>一定的反应.草履虫虽然结构很简单,但对外界的有利刺激或有害刺激能够<br>作出<br>反应。如图所示,取甲、乙两块载玻片,分别在载玻片两端各滴一滴草履虫培养液,并使两滴培养液连通,然后在两块载玻片右侧培养液的边缘分别放少许食盐和肉汁。据图回答下列问题。<br><img src="https://picture2.zhihuicn.com/testImage/2/2019/10/18/AC305511078D2530E48B2262B442904D.png"><br>1.观察草履虫的移动方向,并在图中括号内用箭头表示草履虫的移动方向。2.用吸管从草履虫培养液中吸取草履虫的最佳部位(填培养液的表层、培养液的中层或培养液的下层),原因是。3.根据实验现象,你能得出的结论是。<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/9/2019/f9bfef1488c546b4b48b0c9af25a1860/265ED361C2F6692F66C5C58B83424959.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/9/2019/167fefc293994350995261456df82cbb/D30C0DA1453BD6C6DDA76E14E15668BC.png"><br><br>
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