皮皮学，免费搜题
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【单选题】
大肠杆菌乳糖操纵子在环境中糖源仅有乳糖时A.
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B.
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C.
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D.
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E.
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举一反三
【单选题】Which of the following statements about the little quiz is CORRECT?
A.
The place of the quiz need to be fixed.
B.
The purpose is to find out if your boss is a madman.
C.
The only question is if a boss is a superficially charming person.
D.
One of the question is if a boss has a lot of real and helpful friends.
【单选题】The ovary has three layers of tissue. Generally, the _______becomes the fruit flesh. In many cases, he three layers are indistinguishable, and the term ______ is applied to denote all ovarian tissues ...
A.
exocarp, pericarp
B.
mesocarp, endocarp
C.
mesocarp, pericarp
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