在普通光镜上可用于调节视野内光线强弱的装置有（） A.通光孔 _爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题多项选择题

在普通光镜上可用于调节视野内光线强弱的装置有（）

A.通光孔

B.反光镜

C.光阑

D.聚光镜

E.目镜

答案

参考答案：B, C, D

完形填空

完形填空。
     My name is Kate White. I like singing songs and I thank my parents for giving me a    1 voice
(嗓音). I am sure that nobody else in my class can    2   as well as me. My favorite band is McFly. I
hope to be as    3   as them one day. I write my own (自己的) songs. Most of my songs are    4   life
in my dream world. I    5   writing songs. When I write songs, I feel    6   because I can show my feelings
in the music. I have written many different songs -not all happy -   7   I love writing them. I really love my
music and    8   to become a famous star one day. I am planning to record my music and send it off to
recording studios (录音棚). I don't think about    9   a lot of money in the future. I just want to do   10
I enjoy doing.

( )1. A. bad
( )2. A. dance
( )3. A. famous
( )4. A. about
( )5. A. practice
( )6. A. sad
( )7. A. so
( )8. A. forget
( )9. A. finding
( )10. A. what

B. sick
B. speak
B. friendly
B. with
B. begin
B. tired
B. and
B. need
B. borrowing
B. how

C. good
C. sing
C. healthy
C. over
C. finish
C. angry
C. but
C. have
C. seeing
C. why

D. terrible
D. swim
D. tall
D. for
D. like
D. happy
D. or
D. want
D. making
D. when

填空题

水是一种宝贵的自然资源，它有许多性质和用途，请回答下列问题：

（1）除去水中的不溶性物质，常用的方法是；

（2）用水可除去某些混合气体中的性杂质（选填“难溶”，或“易溶”）

（3）自然界中的水在一定程度上可以缓解二氧化碳对地球所造成的。