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问题 选择题
已知复平面内的平行四边形ABCD中，定点A对应的复数为i，向量
BC
对应的复数为2+i，则点D对应的复数为（　　）
A．2B．2+2iC．-2D．-2-2i
答案

由题意可得

BC
=
AD
，∴2+i=ZD-i，∴ZD=2+2i，即点D对应的复数为 2+2i，

故选B．

单项选择题

女性，26岁，1周前出现尿频、尿急，尿检有白细胞3～5个／高倍视野，服氧氟沙星1周无好转，并出现咳嗽时有尿液流出。其尿失禁为（）

A.轻度到中度尿失禁之间

B.中度尿失禁

C.重度尿失禁

D.轻度尿失禁

E.中度到重度尿失禁之间
查看答案
句型转换

句型转换。

1. My father stayed there for two months. (对划线部分提问)

    ________ ________ did your father ______ there?

2. He went to school at the age of seven. (改为同义句)

    He went to school ________ he ________ seven years ________.

3. This bike is new. (改为复数句子)

     ________ bikes ________ new.

4. We played basketball yesterday afternoon. (对划线部分提问)

    ________ ________ you ________ yesterday afternoon?

5. He is too short. He can't reach the banana. (改为一句话)

    He is ________ short ________ ________ the banana.

查看答案