题目内容

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

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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

25. So little _____ about mathematics that the lecture was completely beyond me.

A. I know
B. I knew
C. do I know
D. did I know

26. It was not long _____ the news spread and people from all over the world came to visit this miracle of nature.

A. after
B. before
C. until
D. when

27. No sooner had we reached the top of the hill _____ we all sat down to rest.

A. when
B. then
C. than
D. until