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专题导读 专题二│ 专题导读 说明文是对事物的特征、本质、性能、状态，或事物的发生、发展、结果、用途、原理等进行介绍、解释、说明的一种文体。其语言特点有： 1．多用现在时态。因为说明文通常是对客观事物或事理的一种介绍与解释。 2．采用客观描述。说明文一般是对客观存在的说明与介绍，因此，语言的表述也应该尽可能地给人以客观可信的感觉。 专题二│ 专题导读 分析句子结构是答题过程中很关键的一步。做题时，首先确定句子的主谓宾成分，看看该句子缺不缺谓语动词，然后再考虑非谓语动词或者其他成分。此时，要借助上下文的暗示或明示，确定需要填入词语的词性、形式和功能等。 典例导练 专题二│ 典例导练 [2010·广东省广州重点中学六校联考] The air we breathe is freely available, without which we could not survive more than a few minutes. For the most part, air is available to everyone, and everyone 1.________ (need) it. Some people use the air to sustain them while 2.________(seat) around and feel sorry for themselves. 3.________ breathe in the air and use the energy it provides to make 4.________ magnificent life. Opportunity 专题二│ 典例导练 is 5.________ same way; it is everywhere. It is 6.________freely available that we take it for granted. Yet opportunity alone is not enough to create success; it 7.________ (seize) and acted upon in order to have value. So many people are so anxious to “get in” on a “ground floor opportunity”， as if the opportunity will do all the work that’s 8.________(possible). Just as you | 
