What is the main topic of this news？A．How to ensure safe navigation at night.B．The possibl
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What is the main topic of this news？
A．How to ensure safe navigation at night.
B．The possible reasons for greenhouse effect and the solutions.
C．How to use the Sun"s rays to help flights.
D．Negative effects of the nighttime flight on the environment.
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
主旨大意题。遇到这样的题，我们可以更多的关注新闻的开头和结尾。本段新闻在开始就谈到“科学家们声称夜间飞行对环境造成的危害要大于日间航行”。而结尾也举出了一个数字的例证来说明夜间航行给环境带来的危害。所以D项所归纳的意思是符合本段新闻的主旨的。