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【单选题】
β-内酰胺类抗生素的作用机制是A.
干扰核酸的复制和转录
B.
影响细胞膜的渗透性
C.
抑制粘肽转肽酶的活性，阻止细胞壁的合成
D.
为二氢叶酸还原酶抑制剂
E.
干扰细菌蛋白质的合成
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【单选题】—What time do you usually get up? —_____. [ ]
A.
I usually get up in the morning.
B.
I usually get up on the morning.
C.
I usually get up at nine o'clock.
D.
I usually get up at nine forty o'clock.
【单选题】The toughest thing about success is ________ you have to keep on being a success.
A.
why
B.
when
C.
what
D.
that
【简答题】阅读理解。 Ma Li: Do you get up early in the morning, Ellen? Ellen: Yeah, I get up at six in the morning. After that I run. Then I take a shower and eat breakfast at seven. What about you? Ma Li: Me? I g...
【单选题】I used to early,but now I am used to late.
A.
getting up ,getting up
B.
getting up ,get up
C.
get up ,get up
D.
get up ,getting up
【单选题】The toughest thing about success is _______ you have to keep on being a success.
A.
that
B.
when
C.
what
D.
why
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