单项选择题

Early cancer screening can help reduce significantly

A．the death rates for all chronic diseases.
B．the kinds of cancer attacking people.
C．the incidence rate for cancer.
D．the death rate for cancer.
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单项选择题
Which of the following is NOT true of chronic diseases in the US
A．They account for 70% of all deaths.
B．They are responsible for most of the health care costs.
C．They often result in unhealthy lifestyles.
D．They are largely preventable.
单项选择题
Which of the following is NOT true of Crystal Ear
A．It is highly sensitive.
B．It is powerful.
C．It is invisible.
D．It is wireless.
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