4.for
此处表目的,for a vacation表度假。
5.and
表并列关系,连接left home 和got there两个动词短语。
6.When
考查由When引导的时间状语从句:
7.How
How 引导的感叹句。
8.later
a few minutes later意为“一会儿后”。
9.a
不定冠词,泛指一张桌子。
0.to spend
动词不定式短语作目的状语。
3阅读理解
阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。
词数:254 完成时间:6分钟 难度:**
Science Daily (Apr. 27, 2008)-- Dutch ecologist Roxina Soler and her colleagues have discovered that subterranean (地下的) and aboveground herbivorous (食草的) insects can communicate with each other by using plants as telephones.
Subterranean insects issue chemical warning signals through the leaves of the plant. This way, aboveground insects are warned that the plant is already "occupied".
Aboveground, leaf-eating insects prefer plants that have not yet been occupied by subterranean root-eating insects. Subterranean insects send out chemical signals through the leaves of the plant, which warn the aboveground insects about their presence. This messaging makes it possible for spatially-separated insects to avoid each other, so that they do not compete for, the same plant.
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