The main idea of the second paragraph is that ______. The main idea of the final paragraph is that ______.

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问题 The main idea of the second paragraph is that ______.
The main idea of the final paragraph is that ______.

选项 A、in an emergency all the technical alternations should be studied
B、expert should be specially trained to determine the exact difference between detergent and chalk
C、we ought to decide what measures to take before a disaster occurs
D、technical experts should be examined and tested to see whether they are capable of selecting the right course of action in a future emergency

答案C

解析 根据文章最后一段,对这些可能性的研究表明,采取措施可以减少未来的灾害。要做到这一点,提前检验或实验所要采取的措施是十分必要的。四项中只有答案选项符合文意。
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