题目内容

在ＡＤＭ网络图中，有时为了表示逻辑关系，需要设置一个虚活动，虚活动是不需要时间和资源的，一般用（）表示。

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Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections.Section ADirections: In this section, there are 10 incomplete sentences.21. It is curious how children always behave much worse when they are _____ holiday.

A. on
B. in
C. at
D. for

22. Last week, I got a copy of New English 900 at a bookstore; after I read it, I went on _____ theNew Concept English.

A. reading
B. in reading
C. to read
D. read

23. It is perhaps not generally realized _____ to make really accurate translations of high technical material.

A. how difficult it is
B. how difficult is it
C. how it is difficult
D. how is it difficult

24. _____ on a clear day, far from the city crowds, the mountains give him a sense of infinite peace.

A. If walking
B. While walking
C. Walking
D. When one is walking