On this occasion, one is not supposed to behave this way, _________?
A. does one
B. is one
C. are they
D. do they
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I ought to go with you, _______?
A. did I
B. shouldn’t I
C. should I
D. did I not
What a funny boy, ________?
A. aren’t you
B. aren’t they
C. isn’t he
D. is he
Which of the following tag questions is INCORRECT?
A. Carry this parcel for me, will you?
B. Nobody wants to go there, don’t they?
C. Some people know him, don't they?
D. Everything is ready, isn't it？
一根半埋于泥土中的铁管时间久后发现泥土中的部分铁管腐蚀严重，而暴露于空气中的部分腐蚀较轻，这种腐蚀称作。（ ）
A. 析氢腐蚀
B. 差异充气腐蚀
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