题目内容

--- Do you mind if I join you？ --- __________ .

A. I’m very happy to do so
B. Never mind
C. Please do
D. Oh, I can’t

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The government official explained that there’s no point ___________ about the cultural gap

A. to worry
B. with them worrying
C. in worrying
D. worry

--- Sorry to interrupt, but can you give me another copy of the handout？ --- __________ .

A. No, of course not
B. Certainly
C. I’m sorry to hear that
D. By no means, but it’s impossible

镰状红细胞贫血症是一种先天遗传性的分子病，其病因是由于正常血红蛋白分子中的一个G1u残基被_________残基所置换。

塔吊司机操作中严格掌握起重机规定的()不得超载作业。

A. 有效起重量
B. 额定起重量
C. 总起重量
D. 提升高度