A. and B. but C. or D. so
A.、Cell phone use is dangerous。
B、Cell phone use causes cancer。
C、The human brain is an electromagnetic field。
D、There are about 5 billion cell phone users in the world right now。
A. Had you come B. Did you come C. Have you come D. Should you come
A. deeper B. slower C. further D. higher
A. suppose B. assume C. assure D. grant
A. in exchange B. instead C. in return D. in particular
A. Watching B. Watch C. Watched D. Having watched
A. it is B. is it C. it is that D. is it that
A. Those mothers who had never breastfed. B. Those mothers who never gave birth.
C. Those mothers who breastfed for a month. D. Those mothers who breastfed for six months.
A. About two thousand and two hundred old women took part in the study.
B. Eleanor Schwarz's research program was about men and women who suffered from diabetes.
C. Over one fifths of the women never got married.
D. Eleanor Schwarz's results seem more reliable.
A. human attention is a scarce resource B. city life can make people very tired
C. the city is an engine of intellectual life D. an urban environment is damaging to the brain
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