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【单选题】
蛋白质在等电点时具有的特点是A.
不带正电荷
B.
不带负电荷
C.
既不带正电荷也不带负电荷
D.
在电场中不泳动
E.
溶解度最高
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反馈参考答案：
举一反三
【单选题】---Hello, this is Tom. May I speak to Amy, please? ---Hi, Amy isn't at home. She went to the supermarket just now. ________
A.
You can call her later.
B.
You can talk with me.
C.
Would you like to go with her?
D.
Anything else?
【单选题】A: I saw Tom just now at the café B:It ( )be him. He went to U.S.A. yesterday. A. mustn't
B.
can't
C.
shouldn't
【单选题】Tom:“Just now I went into the ladies room by mistake. I felt so ____________.”
A.
embarrassing
B.
embarrass
C.
embarrassed
D.
to embarrass
【简答题】A. I have to study hard now. B. No, you needn’t. I just went to bed late last night. C. Yeah. I’ll never do that again. D. I have a pain（疼痛） in my head. E. You’d better learn from others. F. O...
【单选题】在行程中贴近肱骨的神经是
A.
正中神经、尺神经和桡神经
B.
腋神经、桡神经和尺神经
C.
腋神经、桡神经和正中神经
D.
腋神经、桡神经和肌皮神经
E.
正中神经、肌皮神经和尺神经
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