皮皮学，免费搜题
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【单选题】
具有复层柱状上皮的部位是A.
角膜
B.
虹膜
C.
视网膜
D.
球结膜
E.
睑结膜
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皮皮学刷刷变学霸
举一反三
【单选题】Why does the author mention fresh coffee in Paragraph 2?
A.
As an example of complex substances having not been duplicated satisfactorily.
B.
Because the coffee fragrance is hard to produce.
C.
To conclude the passage.
D.
The smell of fresh coffee is inviting.
【简答题】听力原文： We live in a society in which the medicinal and social use of substances is pervasive: an aspirin to quiet a headache, some wine to be sociable, coffee to refresh oneself in the morning. When do...
【简答题】安全评价也称( ),是以实现系统安全为目的
【单选题】. It is far better for one to drink milk, ________ one gets healthful nutrients, than to drink coffee, ________ contains harmful substances.
A.
what, what
B.
where, which
C.
from which, which
D.
in which, what
【简答题】Substances in coffee can ______ _______ iron being absorbed into the body.
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