沉降分离脱水就是利用水重油轻的性质，通过特定的装置进行沉降，_爱下问搜题

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问题单项选择题

沉降分离脱水就是利用水重油轻的性质，通过特定的装置进行沉降，使（）而将油、水分开。

A、原油下沉

B、水上浮

C、水下沉

D、原油上浮

答案

参考答案：C

完形填空

完形填空。
     We have a two-day holiday __1 _ week. We don't have any lessons __2__ Saturday or Sunday.
So every weekend I have a good __3__.
     On weekend, I like __4_   a trip.  I sometimes go to the country with my classmates __5__ bus to
breathe (呼吸) the fresh air., watch the green hills and blue water, and __6 _ in the beauty of the country.
sometimes I go for a picnic in the open   _7__ with my friends by bike, we sing and dance __8 __ there.
Sometimes I go to __9__ a place of interest with my parents by car. My weekend is always _ 10__
interesting and happy.

( )1. A. one
( )2. A. on
( )3. A. day
( )4. A. to play
( )5. A. on
( )6. A.. walk
( )7. A. place
( )8. A. happy
( )9. A. see
( )10. A. many

B. other
B. in
B. week
B. take
B. in
B. goes
B. air
B. happily
B. watch
B. very

C. every
C. this
C. time
C. taking
C. take
C. runs
C. room
C. unhappy
C. visit
C. a lot of

D. last
D. at
D. month
D. took
D. by
D. jump
D. ground
D. unhappily
D. look
D. feel

填空题

“花气袭人知骤暖，鹊声穿树喜新晴”，这是南宋诗人陆游诗句。对于前一句，从物理学角度可以理解为：花朵分泌的芳香分子______加快，说明当时周边的气温突然________。