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问答题

Complete the sentences with the words you hear.To understand the power of the ______, scientists want to recreate the ______ from 65 million years ago. What do the scientists see about the explosion? One of the first things is a ______, and it is moving very fast. It’s a very powerful ______. And it can ______ almost anything. In this experiment, ______ from the explosion rains down for more than ______ seconds.

判断题

膳食软件法的数据库一旦确立，无需更新，可长时间使用。
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