题目内容

体细胞中含有2n+1条染色体的植物称为( )植物。

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什么是植物染色体工程?在农业生产实践中有何应用?

Read the sentence and choose the best answer.The price of diamond rings has raised sharply _______the price of gold rings has gone down.

A. when
B. as
C. while
D. otherwise

_______ I know, the computer can never take the place of the human brain.

As for
B. As long as
C. So far as
D. As far as

You’ll surely make progress _______ you work with a strong will.

A. unless
B. until
C. as long as
D. as well as