题目内容

It is proper that you _________ （concentrate on) the chairman’s speech in such a formal meeting.

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理想土壤的空气含量（孔隙度）应达到（）%。

4. Crossing your arms when you’re speaking means you’re not sure what you’re saying.

If there are two forks on the table, you should start using the fork closest to the plate.

树木侧根能够在土壤中蔓延的范围可以大于植物的冠幅。