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听力原文：M: Doctor, I feel sick. I have a bad stomachache, and my head troubles me a lot. W: Well, let me have a check. Open your mouth, please. And say 'Ah'. M: Ah! Is that serious, doctor? W: Not really. Did you have your supper this evening? M: No, I only had some bananas. W: And the bananas were not quite ripe, right? M: Well, yes, they were a bit green. W: That explains it. M: I wish I had not eaten them. W: Take this medicine twice a day and I' m sure you' 11 be fine. Did the man have a bad headache?A.
Yes, he did.
B.
No, he didn't.
C.
We are not sure.
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举一反三
【单选题】在高分子材料的拉伸试验中,提高拉伸速率时,则( )。
A.
σB升高、εB降低
B.
σB降低、εB升高
C.
σB升高、εB升高
D.
σB降低、εB降低
E.
程度:难
【单选题】在高分子材料的拉伸试验中,提高拉伸速率时,则( )。
A.
σ B 升高、ε B 降低
B.
σ B 降低、ε B 升高
C.
σ B 升高、ε B 升高
D.
σ B 降低、ε B 降低
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