What do the man and the woman talk about
A book on birds.
B. Species of birds.
C. A man chasing birds.
D. Activities of watching birds.
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What does the man think of the criticism
A. It's acceptable.
B. It's unfair.
C. It's extremely severe.
D. It's defensibl
Why is the author attracted by Hank Walker's pictures
A. Because they are about the Kennedy brothers.
Because they are still.
C. Because they display many objects.
D. Because Hank Walker was a famous photographer.
火力发电厂排出的烟气会造成对大气的污染,现代大型电厂的主要污染物是( )。
A. 二氧化碳和二氧化硫
B. 粉尘和二氧化碳
C. 二氧化硫和氮氧化合物
检修周期是指相邻两次( )之间的间隔时间。
A. 小修
B. 临修
C. 大修
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