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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?

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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
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A. unless
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I'll stay here _______ everyone else comes back.

A. even if
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C. because
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