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【单选题】
What did scientists think was true?A.
Each person has a fixed weight range．
B.
Each person has a weight ranged of 9 kg．
C.
Each person wants to control his weight．
D.
Each person wants to eat to his heart’s content．
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A.
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B.
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C.
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A.
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A.
增大抗菌谱，提高抗菌活性
B.
增加对β-内酰胺酶的稳定性
C.
明显改善抗菌活性和药代动力学性质
D.
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A.
增生早期
B.
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C.
排卵期
D.
分泌早期
E.
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