单项选择题

A．quiet
B．obscure
C．faint
D．silent
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单项选择题
The researchers said ... which shows another potentially preventable public health disaster. What does another potentially preventable public health disaster here refer to
A．Smoking
B．Obesity in young adults
C．Drinking
D．Obesity in elderly adults
单项选择题
Dr. Fukuda and his colleagues reported that the virus was especially deadly in people over
A．55
B．65
C．75
D．85
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