The passage is mainly about ______.
A. what constitutes an air pollutant
B. the serious impact of air pollution
C. how much harm air pollutants can cause
D. the effects of compounds added to the atmosphere
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It can be inferred from the first paragraph that ______.
A. water vapor is an air pollutant in localized areas
B. the definition of air pollution will continue to change
C. most air pollutants today can be seen or smelled
D. a substance becomes an air pollutant only in cities
What is the passage mainly about？
A. Businesses' gaining profit from the Olympics.
B. The 1996 Atlanta Olympic Games.
C. The Olympic sponsorship.
D. Importance of the Olympic Games.
Woman: Mr. Scott came back from L.A.very late yesterday. Man: So, even if he had been able
A. Mr. Scott was late for the party.
B. Mr. Scott didn't attend the party at all.
C. Mr. Scott attended the party.
D. Mr. Scott did not like attending parties.
A．Grade all the homework.B．Clean the professor's office.C．Help the professor in the cl
A. Grade all the homework.
B. Clean the professor's office.
C. Help the professor in the classroom.
D. Sort all the documents.
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