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【单选题】
DNA双螺旋模型建立最重要的意义是( )A.
证明了遗传物质是DNA，而不是蛋白质
B.
揭示了DNA的结构奥秘与DNA记录与传递遗传信息的机制
C.
表明DNA的3个核苷酸编码一个氨基酸
D.
预示DNA的两条链均可以作为模板
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举一反三
【单选题】They always do _____ every day, because they know it is _____ for them to do so. [ ]
A.
enough exercise; enough easy
B.
exercise enough; easy enough
C.
enough exercise; easy enough
D.
exercise enough; enough easy
【简答题】Grace always exercises at six in the morning. ( 否定句 ) Grace ___________ exercises at six in the morning.
【单选题】The most important__________ of his speech was that we should all work wholeheartedly for the people.
A.
element
B.
spot
C.
sense
D.
point
【单选题】To keep fit, you should take more______ . Don’t be always busy doing your ______.
A.
exercise; exercise
B.
exercises; exercises
C.
exercises; exercise
D.
exercise; exercises
【简答题】在Excel2010中每个单元格中最多可以容纳___个字符。
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