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
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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
The second paragraph means that _______.
A．only students from China study at the top universities
B．no other students but Japanese and Chinese students study at the top universities
C．Chinese students often fight against Japanese students
D．famous universities in the United States attract more Chinese students
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