According to the passage, pollution of the air and water is caused by______.
A. thousands of tons of gases coming out of the exhausts of motor vehicles
B. the changes of the environment that technology has brought to man
C. the increasing amount of oil that has been produced
D. industrial wastes discharged into rivers
查看答案
A．condemnB．conductC．confineD．confront
A. condemn
B. conduct
C. confine
D. confront
A．facilitiesB．apparatusC．devicesD．equipment
A. facilities
B. apparatus
C. devices
D. equipment
A．repeatedlyB．relativelyC．respectivelyD．respectfully
A. repeatedly
B. relatively
C. respectively
D. respectfully
A．persistedB．guaranteedC．convincedD．trusted
A. persisted
B. guaranteed
C. convinced
D. trusted
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