题目内容
Young scientists ______ that existing scientific knowledge is not nearly so complete, certain and unalterable as many textbooks seem to imply,
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He warned me that I had better not say anything about that. The phrase "had better ”,used in this sentence is to_____
The great racing driver,Sir Malcolm Campbell,was the first man_____at over 300 miles per hour.
Researchers found that the plants were very old indeed, and _____ in these spots some 115,000 years ago.
The Emancipation Proclamation _______ slaves free, but it only applied to the three million slaves who lived in the so-called Confederacy.
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