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【单选题】
古代方士们追求“长生不死”、“服食飞升”的“真人饭”居然源自()药材。A.
朱砂
B.
雄黄
C.
砒霜
D.
汞硫散
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反馈参考答案：
举一反三
【简答题】企业生命周期中最危险的阶段是()。 A、婴儿期 B、青春期 C、盛年期 D、官僚期
【简答题】(ex3)求矩阵 的逆和特征值。
【单选题】Mrs. Black doesn't believe her son is able to design a digital camera, ______? [ ]
A.
is he
B.
isn't he
C.
doesn't she
D.
does she
【单选题】Mrs. Black doesn’t believe that her son is able to design a digital camera, ______?
A.
is he
B.
isn’t he
C.
doesn’t she
D.
does she
【单选题】I don't believe Jim is able to design a digital camera, ______? [ ]
A.
is he
B.
isn't he
C.
doesn't he
D.
does he
【单选题】Black doesn’t believe his son is able to design a digital camera,_____?
A.
is he
B.
isn’t he
C.
doesn’t he
D.
does he
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