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【单选题】
具有四级结构的蛋白质的特征是A.
分子中必定含有辅基
B.
是所有蛋白质的最高结构形式
C.
每条多肽链都具有独立的生物学活性
D.
依赖肽键维系四级结构的稳定性
E.
由两条或两条以上独立具有三级结构的多肽链组成
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【单选题】Even though the mayor was not______the argument for the proposal, she decided to forgo her vote.
A.
influenced by
B.
cognizant of
C.
in support of
D.
opposed to
E.
indifferent to
【单选题】Mr. Huang decided to buy that CD player it was expensive.
A.
even though
B.
so that
C.
because
D.
as if
【单选题】Tired _______ he was , he decided not to trouble her.
A.
as
B.
although
C.
unless
D.
even if
【单选题】It has been decided that all the students ______ stay in the classrooms even on Saturday evenings in case they go to Internet bars.
A.
must
B.
can
C.
need
D.
shall
【简答题】In the _________ half of the 17th century those cities became even more prosperous. A) latter B) latest C) later D) late
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