within、under、towards、upon

文章作者 100test 发表时间 2007:03:25 21:08:18
来源 100Test.Com百考试题网

within、under、towards、upon

问：The survival of civilization as we know it is ____ threat .

A) within B)under C)towards D)upon

解：句意为："当今人类文明的生存正在受到威胁。"在4个选项中，只有B) under
表示"在…..情况下"或"遭到"。

Is under threat 相当于 is experiencing threat .故B)under 为解。如：

Did he do it voluntarily or under compulsion ? 他是自愿做的，还是强迫做的？

The road was under repair so we had to go round .这条道路正在修理，因此我们只得绕道而行。

The fire was soon brought under control .火势很快得到控制。

选项D）不能与threat 搭配表"遭遇"之意。Upon 可以表示"在….后立即"。如：

Upon conclusion of these studies，the patient was told that she had a severe problem.
在这些研究一有结论之后，病人就被告知有严重的博Towards 意为"向….对….."如：

The talks made little evident progress towards agreement .谈判几乎没有向达成协议的方向取得进展。

问： By the end of this month , we surely ____ a satisfactory solution to the problem .

A) have found B)will be finding C) will have found D)are finding

解：本题考核谓语动词时态的用法。句中时间状语 by the end of this month (到本月底)表示未来的某一时刻，后面说"肯定能找到一个满意的解决问题的办法"，即句子谓语动词的动作 find 要在该时刻前完成。因此需用将来完成时态。故答案为 C)

will have found .如：

when we get there they’ll probably have left 我们到那里时他们可能已经走了。

He will have finished his novel by next Friday .他将在下星期五前写好他的小说。