2．下列哪一组都是光源　　 (　　 )

A．电池和萤火虫　 B．恒星和月亮 　C．萤火虫和月亮　　 D．萤火虫和火焰

知识点二　 光沿直线传播的现象及应用．

1．能发光的物体叫光源，光源有两类：一类是　　　 光源，另一类是　　 光源．

15、　　　 I explained on the phone,your request will be considered at the next meeting.

A、When　　　　 B、After　　　　　 C、As　　　　　　　　　 D、Since

1-----5CDDBB　　　 6----10DAAAC　　　　 11-----15CDACC

14、I walked in our garden,　　　 Tom and Jim were tying a big sign onto one of the trees.

A、which　　　　 B、when　　　　　 C、where 　　　　　　　D、that

13、Great changes have taken place in that school.It is no longer　　 　it was 20 years ago,　　　 it was so poorly equipped.

A、what;when　　 B、that;which　　　 C、what;which　　　　　 D、which;that

12、You must keep on working in the evening,　　　 you are sure you can finish the task in time.

A、as　　　　 B、if　　　　 C、when　　　 D、unless

11、Hardly had the game begun　　 it started to rain.

A、as　　　　 B、than　　　 C、when　　　 D、while

10、Is this museum　　　 they visited last year?

A、which　　 B、that　　　 C、the one　　　 D、where

9、They talked about things and persons　　　 they remembered in the school.

A、that　　　 B、who　　　 C、which　　　　 D、whom

8、I wish it　　 fine tomorrow.

A、would be　　　 B、will be　　　 C、is　　　 D、to being