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【单选题】
蛋白质分子中二级结构的维系主要依靠的化学键是A.
肽键
B.
疏水作用
C.
氢键
D.
离子键
E.
二硫键
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Ms Li is strict________her work；however，she is not so strict________her students. [ ]
A.
with；in
B.
about；in
C.
in；with
D.
in；about
【简答题】Li Yan is a Chinese girl. She lives in Yangzhou with her grandparents. Her parents are in England now and Li Yan will go there this summer holiday. But her spoken English is not good. She does well in...
【单选题】– Look at the lady there. ______ it be Miss Li? -- No, it ______ be her. She left for Paris this morning.
A.
Must; can’t
B.
Can; may not
C.
May; mustn’t
D.
Can; can’t
【简答题】The fact that she had become wealthy did not tempt her to alter her frugal li______.
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