单项选择题

According to the passage, all of the following have caused damage to the paintings EXCEPT ()

A. temperature changes
B. air movement
C. water
D. light

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单项选择题

Flossing effectively helps to keep your mouth healthy by preventing ()

A. germs from producing acid
B. food from entering your body
C. germs from entering into your blood
D. acid from contacting your teeth and gums

单项选择题

56（）

A. Thank you for coming along
B. I’m ready
C. I was looking for a part-time job
D. When will I know
E. It is a great job
F. That about covers it
G. How long do I have to wait
H. I have