题目内容

If I were you, I would __________ electricity. It is dangerous.

A. stay away from
B. keep far from
C. stay away
D. keep from

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慢性汞中毒的三大主要临床表现为

A. 脑衰弱综合征、口腔一牙龈炎、腐蚀性胃肠炎
B. 震颤、口腔一牙龈炎、脑衰弱综合征
C. 口腔一牙龈炎、间质性肺炎、皮炎
D. 间质性肺炎、肾炎、皮炎
E. 震颤、肾炎、口腔一牙龈炎

In our class there are 46 students, __________ half wear glasses.

A. in whom
B. in them
C. of whom
D. of them

Only after they had discussed the matter for several hours __________a decision.

A. they reached
B. did they reach
C. they reach
D. do they reach

--Catherine, I have cleaned the room for you.--Thanks. You__________ it. I could manage it myself.

A. needn’t do
B. needn’t have done
C. mustn’t do
D. shouldn’t have done