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
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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
关于矿山井下爆破施工，以下做法错误的是（）。
A. 不混合使用不同厂家生产的电雷管
B. 非煤矿井下采用正向装药结构
C. 装药前清除炮眼内碎石
D. 水炮泥封眼时将其塞满装药后的炮眼
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