题目内容

材料的孔隙率越低,材料越密实,强度越高。

A. 对
B. 错

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1. Johntoldusthat by theendoftheyearthey togetherfor thirty years.

A. would have been living
B. wouldhave lived
C. would have been lived
D. will have been living

2. He on this essay for twenty minutes but he only a hundredwords.

A. has been working/has written
B. has worked/has been writing
C. is working writes
D. works/is writing

3. We fine weatherforthe pastfew days.

A. have
B. are having
C. have had
D. have been having

4. My brother was losing hiskeys.

A. onceinawhile
B. always
C. sometimes
D. occassionally

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