紫外线的波长范围（） A.320～400nm B.200～275nm C.小于400

阅读短文，根据不同的人物介绍选择与之相匹配的房间图片，有一幅图片多余。

( )1. My name is Helen. This is my room. Can you see the sofa?  The girl on the sofa is my sister. I like books and plants. You can see them in my room.

( )2. Look!   This is my grandfather's room. You can see a chair, a table and a TV in it. The TV is on

the table.

( )3. This is my bedroom. You can see some things in it: a bed, a desk, a chair and a bookcase. Some

books are in the bookcase and three pictures are on the wall.

( )4. This is my parents'room. A bed, a sofa, a TV and some tables are in it. Some pictures are on the

wall and some plants are on the floor.

( )5. I'm Lucy. I like computer games and toys. You can see a computer and some toys in my room.

. __________ in Hangzhou station for two hours, the old man eventually caught the last train to go back to his home in Huangyan.

A．Waiting

B．To wait

C．Having waited

D．To have waited

Cache的作用是（）。

A.处理中断请求并实现内外存的数据交换

B.解决CPU与主存间的速度匹配问题

C.增加外存容量并提高外存访问速度

D.扩大主存容量并提高主存访问速度

我国《招标投标法》并没有把（）作为招标方式。

A.公开招标

B.邀请招标

C.议标

凡建群种生活型(一级或二级)相同或相似，同时对水热条件的生态关系一致的植物群落联合为：______。