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【简答题】
生命是宇宙中的一种普遍现象，这种观点自古有之。随着近代自然科学的发展，特别是天体物理学的发展，人们认识到，由“特殊”行星的物理环境造化的生命——这里指的是地球上的生命，是由简单的无机物质发展而来的，虽说其产生和发展过程非常复杂，但生命现象一经开始，就会逐步地向智慧生命阶段发展。的生物进化论在天文学上的一个影子是天体演化理论。美国著名的天文学家沙说过：“生命是广泛存在的，它是宇宙演化的自然产物。” 对以上文字的主旨概括最准确的一项是（ ）。
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举一反三
【单选题】In the last paragraph, the author tries to justify his conclusion by
A.
reducing to absurdity.
B.
making an comparison.
C.
giving an example.
D.
explaining a phenomenon.
【单选题】In the third paragraph, the author tries to demonstrate that our siblings
A.
offer us much useful information.
B.
have great influences on us.
C.
are the ones who love us completely.
D.
accompany us throughout our life.
【单选题】In the passage, the author tries to tell us purely entertainment programs similar to the classic 'Bewitched'______.
A.
are as good as those in the U.S.
B.
have been seen on many government-controlled networks
C.
are as gray and dismal as the uninformed might unnecessarily visualize
D.
are not as gloomy as the uninformed might unnecessarily visualize
【单选题】What conclusion can we draw from the passage?
A.
The author tries to tell the readers how important the language is.
B.
The author intends to explain the significance of culture in global communication.
C.
The author thinks his mistake is only an awkwardness in his everyday life.
D.
The author wants to illustrate what the sentence 'Don't use thanks' means.
【简答题】黄酮类化合物常用提取方法有（）法，（）法。用溶剂提取法提取黄酮类化合物，若原料为叶或种子时，可用石油醚处理除去（），（），（）等脂溶性杂质。也可在浓缩的提取液中加多倍量的浓醇，除去（），（）等水溶性杂质。
【简答题】By asking these fundamental questions, the author tries to persuade us to change our view on ________.
【单选题】In the book, the author tries to explain that
A.
money is useless to us.
B.
money is the aim of life.
C.
money should be an instrument.
D.
money is everything.
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