单项选择题

The word "sunscreen" (Line 2, Para. 2) probably means ______.

A．screens used to enjoy the sunlight
B．sun umbrellas
C．creams used to prevent tanning
D．sun glasses
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单项选择题
According to the study, the number of Americans who reported at least one severe sunburn rose from 30% to 39% ______.
A．from 1986 to 1996
B．during 1997
C．from 1987 to 1997
D．during 1996
单项选择题
Doctors feel really worried that ______.
A．their patients will soon get older
B．adults are diagnosed with skin cancer
C．there is an outbreak of deadly aches on the skins
D．many younger people suffer from skin cancer
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