题目内容

从结构与功能的角度,比较厚角组织和厚壁组织。

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从形态与功能的角度,比较筛管与筛胞区别。

Large numbers of drivers in China now depend _____BeiDou for their routing directions.

A. on
B. with
C. for
D. to

We were unable to offer that service _____we hadn't got sufficient personnel to cope with it.

A. although
B. till
C. unless
D. because

When _____a company to work for, some people attach importance to its location.

A. to look for
B. look for
C. looked for
D. looking for

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