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【单选题】
动物的卵细胞与精子形成过程中的不同点包括 ( ) 1次级卵母细胞将进行普通的有丝分裂 2一个卵原细胞经减数分裂最终形成一个卵细胞 3一个卵母细胞经复制滋长后形成一个初级卵母细胞 4卵细胞不经过变形阶段A.
①③
B.
②④
C.
②③
D.
①④
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【单选题】Part A Directions: You will hear 10 short dialogues. For each dialogue, there is one question and four possible answers. Choose the correct answer ― A, B, C or D, and mark it in your test booklet. You...
A.
Reasonable.
B.
Cheap.
C.
Expensive.
D.
Unacceptable.
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