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【单选题】
蛋白质能发生缩二脲反应,是因为蛋白质分子结构中有A.
多个醚键
B.
多个氢键
C.
多个酯键
D.
多个肽键
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反馈参考答案：
举一反三
【单选题】He ____ Tokyo, for I saw him a short time ago.
A.
must have gone to
B.
mustn't have been to
C.
can't have gone to
D.
can't have been to
【简答题】世界上实行养老保险制度的国家可以分为三种类型:()、()、()。
【单选题】—_____ your brother speak Japanese? —Yes, he has learnt it in Tokyo for three years. [ ]
A.
Should
B.
Must
C.
Can
D.
May
【单选题】He will stay in Tokyo for ___________ days.
A.
a pair of
B.
a kind of
C.
a couple of
D.
a piece of
【单选题】He ______ Tokyo for two weeks.
A.
has left
B.
has been away from
C.
has been left
D.
left
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