题目内容

心材的疏导能力强，边材的利用价值高。

A. 对
B. 错

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单子叶植物根和双子叶植物根的主要区别是维管束中没有导管。

A. 对
B. 错

If you agree to_____, please e-mail us by return and we will approach you further.

A. propose
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C. be proposed
D. our proposal

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A. lower
B. higher
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A. of
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