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【单选题】
下列关于PM10和PM2.5的说法，错误的是A.
PM10又称为细颗粒物，PM2.5又称为可吸入颗粒物
B.
机动车排气是一次颗粒物
C.
二次污染物是PM2.5的主要来源
D.
海盐是PM2.5的自然源之一
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举一反三
【单选题】Over the years, as the musical 'Rent' has reached milestone after milestone—playing around the world in more than 200 productions from Boise to Little Rock to Reykjavik—the thousands of people who hav...
A.
Rent was a classical work
B.
Michael Greif was a conservative director
C.
Rent was conservative
D.
people were nostalgic
【简答题】In the past, American families tended to be quite large. Parents raising five or more children were common. Over the years, the size of the family is becoming smaller. One reason for this is an increa...
【单选题】Over the years this country seemed to waver unpredictably between love and hatred for the United States, sometimes begging for its attention, sometimes lashing out at it.
A.
vibrate
B.
hesitate
C.
alternate
D.
fluctuate
【单选题】This doctor has _____ a good reputation over the years.
A.
built on
B.
built up
C.
built in
D.
built out
【单选题】Over the years this country seemed to waverunpredictably between love and hatred, for the United States; sometimes beggingfor its attention, sometimes lashing out at it.
A.
fluctuate
B.
hesitate
C.
vibrate
D.
alternate
【单选题】Over the years this country seemed to waver unpredictably between love and hatred for the United States, sometimes begging for its attention, sometimes lashing out at it.
A.
hesitate
B.
fluctuate
C.
vibrate
D.
alternate
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