严寒地区处于地下水位升降变化范围内的混凝土结构施工时，应优先选用（）水泥配制混凝土。
A. 矿渣
B. 普通硅酸盐
C. 粉煤灰
D. 火山灰
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We can infer from the passage that" entomology" is______.
A. the scientific study of pyramids
B. the study of ancient constructions
C. the study of natural sciences
D. the scientific study of insects
Speaker A: Can I do anything for youSpeaker B:______
A. No. You can' t do anything for me.
B. Never mind.
C. lt' s my pleasure.
D. No, it' s all right. I can manage myself.
W:A man from AT&T would like to talk with the manager on the new project. Is she availableM:______
A. I'm sorry. She is engaged just now.
B. I'm sorry. She is free.
C. Pardon, please. She said she would come to meet sooner or later.
D. She said she should apologize for inconvenience.
Most Americans think that solid growth in 1990s can be attributed to the fact that _____.
American industries have optimized structure to meet new demands
B. US businesses have improved productivity
C. US businesses enjoy better management than their overseas rivals
D. all of the above
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