图示山体主峰的西北坡地形特征是

【名词&注释】

蕨类植物(pteridophyte)、必要条件(necessary condition)、海金沙(lygodium japonicum)、附属物(appendage)、异花传粉(cross pollination)

[填空题]图示山体主峰的西北坡地形特征是

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学习资料：

[单选题]Which of the following is true of the Hatches?A .They had their children during the Great Depression.

A. They left the family farm to live in an old house.
B. They gave away their possessions to their neighbors.
C. They helped their neighbors to find jobs.

[单选题]In our class, when the bell rang and the teacher closed his book, it was a___________ for everyone to stand up.

A. signal
B. chance
C. mark
D. measure

[单选题]---Peter , where did you guys go for the summer vacation?----We________ busy with our work for months, so we went to the beach to relax ourselves.

A. were
B. have been
C. had been
D. will be

[单选题]金缕梅科植物(如枫香)果上的2尖喙由( )发育而来。

A. 子房表皮附属物
B. 宿存的花柱
C. 上位花中花被的变态结构
D. 子房上半部分离部分

[多选题]下列蕨类植物中，叶具叶舌的是( )。

A. 石松
B. 卷柏
C. 水韭
D. 海金沙

[单选题]花单性是进行异花传粉^{(cross pollination)}的必要条件。( )

A. 正确
B. 错误

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