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【单选题】
“六学二馆”是下列哪个朝代中央体系的简称（ ）A.
汉朝
B.
隋朝
C.
唐朝
D.
宋朝
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反馈参考答案：
举一反三
【简答题】Since it is to ask for sick leave, he often uses it as an excuse for staying away from school.
【单选题】The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he often mentions.
A.
served
B.
serves
C.
is serving
D.
has served
【简答题】酶的底物专一性(substratespecificity)(名词解释)
【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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