正确答案: A

正确

题目：卵细胞具有高度的极性。( )

解析：A

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举一反三的答案和解析：

[单选题]

until after

[单选题]—Hi, Tom. Any idea where Jane is? —She_____in the classroom. I saw her there just now.

must be D． might have been

[单选题]

foreing

[单选题]十字花科植物具多种重要经济价值。芸苔属栽培种中以( )种类最多。

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