豌豆花的颜色受两对基因E/e与F/f所控制，假设至少每一对基因中有

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问题单项选择题

豌豆花的颜色受两对基因E/e与F/f所控制，假设至少每一对基因中有一个显性基因（EF）时，花就是紫色的，基因的其它组合花是白色的（这两对基因独立遗传）。下述杂交育种亲本的基因型是（）

A.EEFf×eeff

B.EeFF×Eeff

C.EeFf×eeff

D.EeFf×Eeff

答案

参考答案：D

填空题

阅读下面短文，写出括号内所给动词的正确形式。

I come from Russia. I 1.________ (come) to London six months ago to learn English . I 2.________

(not meet) many English people yet, only my teachers. I started learning English at school in Russia when I was

eleven, so I have learned it for nearly ten years. At first in London, I didn't understand anything, but I studied

hard 3.________ (improve) my English, I have just taken an exam. When I 4._______ (pass), I will move into

the next class. I'm excited today because my parents are coming tomorrow to stay with me for a few days and

I haven't seen them for a long time. They 5.________ (not speak) English.

判断题

公安民警现场制止违法犯罪行为采取使用警械制止措施所使用的警械仅限于驱逐性、制服性警械。