单项选择题

Researchers in the United States carried out the study with the help of _______.

A．young people
B．some old people
C．men doctors
D．woman doctors
<上一题 目录 下一题>
热门 试题

单项选择题
At last the researchers warn us to _______.
A．take aspirin as much as we like
B．take aspirin with care
C．take aspirin without considering anything
D．take aspirin only considering the age
单项选择题
Researchers have studied the connection between aspirin and heart disease for _______.
A．more than a century
B．more than ten years
C．more than one year
D．a few years
相关试题