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.

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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.

单项选择题

One special feature of Crystal Ear is that

A．you can control its volume.
B．you needn't take it off every day.
C．It is solar-powered.
D．It saves power.