叶内中脉的韧皮部靠：近下表皮。( )

【名词&注释】

生活史(life history)、藻类植物(algae)、雄配子体(male gametophyte)、裸子植物(gymnosperm)、世代交替(metagenesis)、韧皮部(phloem)、卵细胞(egg cell)、多年来(many years)、助细胞(synergid)

[单选题]叶内中脉的韧皮部靠：近下表皮。( )

A. 正确
B. 错误

查看答案&解析

举一反三：

[单选题]胚囊中的卵器指( )。

A. 卵细胞^{(egg cell)}
B. 1个卵细胞^{(egg cell)}和2个助细胞^(synergid)
C. 一个卵细胞^{(egg cell)}和二极核
D. 卵细胞^{(egg cell)}和三反足细胞
E. 2个助细胞^(synergid)

[单选题]艾丁湖1万多年来^{(many years)}变迁的主要原因是

A. 围湖造田
B. 绿洲萎缩
C. 湖区汇水面积减少
D. 气候变干

[单选题]Some people are against killing wolves because ．

A. wolves help to keep the ecological balance in the wildemess
B. there is too small a wolf population in the wilderness
C. there are too many deer in the wilderness
D. wolves are afraid of people and never attack people

[单选题]The old man asked Lucy to move to another chair _______ he wanted to sit next to his wife.

A. although
B. unless
C. because
D. if

[多选题]在藻类植物生活史中，核相交替与世代交替的关系正确的是( )。

A. 有核相交替就一定有世代交替
B. 有世代交替就一定有核相交替
C. 有核相交替不一定有世代交替
D. 没有核相交替就一定没有世代交替

[单选题]裸子植物的雄配子体只具一个精子，所以不能进行双受精。( )

A. 正确
B. 错误

[单选题]One of the disadvantages of traveling as an air courier is that he_____.

A. cannot decide when and where to travel
B. cannot take any luggage with him
C. has to wear two pairs of jeans
D. D saves little money from the travel

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