A. talking about
B. referring to
C. listening to
D. carrying out
A. and B. so C. thus D. while
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.
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