2015年6月英语四级考试真题及答案(卷一完整版)_第5页

　　56、B It will protect them from sunburn

　　57、A I is ineffecitive in preventing melanomas

　　58、D Daily application of sunscreen helps reduce the incidence of melanomas

　　59、C It is not based on sirect observation of the subjects

　　60、A A Using both covering up and sunscreen.

　　61. B) Well-educated people tend to work longer.

　　62. B) A rapid technological advance.

　　63. A) Economic growth will slow down.

　　64. C) Even wealthy people must work longer to live comfortably in retirement.

　　65.D) Skills are highly valued regardless of age.