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【单选题】
正常细胞膜内钾离子的浓度约为细胞外的（）A.
12倍
B.
20倍
C.
30倍
D.
32倍
E.
13倍
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举一反三
【简答题】What is true friendship? True friendship doesn’t mean that when you need your friends’ help, you will 36 them to dinner, and you will put your friends in a difficult 37 when you have to protect yourse...
【多选题】What strategies can we use when we read an op-ed?
A.
do some background research before reading
B.
figure out the layout of the op-ed
C.
identify and understand figures of speech
D.
write an op-ed by ourselves
【多选题】DNA结构缺陷造成mRNA或蛋白质结构缺陷的分子病有( )
A.
缺乏6-磷酸葡萄糖脱氢酶
B.
白化病
C.
地方性甲状腺肿
D.
苯丙酮酸尿症
E.
镰刀状红细胞贫血病
【简答题】回流比是指在单位时间内, ______________ 与 ______________ 之比。
【单选题】When she took a op from the small room what mum really wanted to do was______.
A.
to clean the floor
B.
to please the nurse
C.
to see a patient
D.
to surprise the storyteller
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