当地球在甲位置时（ ）。

【名词&注释】

花粉母细胞(pollen mother cell)、有丝分裂(mitosis)、黄河流域(yellow river basin)、洁净度要求、生产控制区

[单选题]当地球在甲位置时（ ）。

A. 黄河流域进入汛期
B. 南极昆仑站正值极夜
C. 三峡水库处于蓄清期
D. 潘帕斯草原处于枯黄期

查看答案&解析查看所有试题

学习资料：

[单选题]What does the author expect to show by Jeff’s story ？

A. honesty can be of great help.
B. A bad thing can be turned into a good one.
C. Helping others cheat can do good to nobody.
D. One should realize the wrong in his bad deeds.

[单选题]

A. answered
B. sighed
C. smiled
D. laughed

[单选题]Professor Williams keeps telling his students that the future______to the well-educated.

A. belongs B． is belonged
B. is belonging D． will be belonged

[单选题]制剂生产控制区的洁净度要求为（ ）。

A. 十万级
B. 万级
C. >十万级
D. 百级
E. 无洁净度要求

[单选题]What is talk mainly about?

A. The history of the term.
B. The courses for the term.
C. The plan for the day.

[单选题]花粉母细胞经过连续两次有丝分裂，可产生4个小孢子。( )

A. 正确
B. 错误

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