根据短文,回答题According to Paragraph 2, what is the general attitu

根据短文,回答题According to Paragraph 2, what is the general attitude towards business

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大气因子对生物的生态作用主要表现在空气的化学成分和空气__________两个方面。

大气因子对生物的生态作用主要表现在空气的化学成分和空气__________两个方面。

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东亚飞蝗的大发生在种群数量变动中属于(  )

东亚飞蝗的大发生在种群数量变动中属于(  )A.周期性波动 B.不规则波动 C.季节消长 D.种群平衡

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The author's primary purpose in writing this passage is to__

The author's primary purpose in writing this passage is to__________.A.[ A ] imp

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Which of the following would be the best title for the passa

Which of the following would be the best title for the passage?A.[ A ] Sex Ratio

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