裸子植物没有( )。

【名词&注释】

必要条件(necessary condition)、裸子植物(gymnosperm)、异花传粉(cross pollination)

[单选题]裸子植物没有( )。

A. 胚珠
B. 颈卵器
C. 孢子叶
D. 雌蕊

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举一反三：

[单选题]What is the researchers' understanding of tbe New Zealand study results?

A. Poorly motivated 26-year-olds watch more TV.
B. Habits of TV watching reduce learning interest
C. TV watching leads to lower education levels of the 15-year-olds.
D. The connection betweenTV and education levels is difficult to explain

[单选题]花单性是进行异花传粉的必要条件。( )

A. 正确
B. 错误

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