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【单选题】
四环素类抗生素在（）溶液中会发生差向异构化。A.
pH2～6
B.
pH<2< /div>
C.
pH>6
D.
pH>9
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【单选题】The scientific study shows that once _____ cigarettes, one will find it hard to get out of it. [ ]
A.
lost to
B.
concentrated on
C.
impressed on
D.
addicted to
【单选题】I found ____ hard to get out of bed on cold winter mornings.
A.
that
B.
this
C.
it is
D.
it
【单选题】Don't expect to get rich without hard work.
A.
You can't get high pay for the job.
B.
You must work hard to make bigm Tapesi
C.
You can't be as rich as others.
D.
It's hard to know the rich.
【单选题】It's hard to get cigarettes out of Hollywood because _____.
A.
Harvard believed that it is not easy to get cigarettes out of movies.
B.
directors are reluctant to do so.
C.
Hollywood needs smoke incident to attract audiences.
D.
the relation between cigarette makers and Hollywood is complex.
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