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【单选题】
有些人从不吃肝脏等动物性食物，但很喜欢吃蔬菜，这些人也不一定会患夜盲症。这是因为有些蔬菜中含有()。A.
维生素A
B.
维生素E
C.
维生素C
D.
胡萝卜素
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A.
served
B.
serves
C.
is serving
D.
has served
【简答题】Lin Feng is a student of Class One, Grade Seven. He likes basketball very much. He often plays it after school. And he often goes home late. His home is not far from school. And his mother knows that ...
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【简答题】底物专一性(substrate specificity)
【单选题】He often travels, but never takes the plane. He thinks it is ______ .
A.
comfortable
B.
dangerous
C.
effective
【简答题】阅读理解。 Mr. Turner likes fishing. It is his favorite sport. He often fishes for hours without catching anything. But this does not worry him. Some fishermen couldn't catch fish. Sometimes they catch old...
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