单项选择题

A serious environmental problem resulting from automobiles is _________.

A．tragic loss of life
B．traffic jams
C．air pollution
D．mental stress
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单项选择题
According to the conversation, what are the experts now recommending
A．Exercising the entire body.
B．Having your blood pressure taken daily.
C．Losing weight prior to exercising.
D．Weighing in before each exercise session.
单项选择题
What will David do this evening
A．Try to find his music books.
B．Look for a new instrument.
C．Start taking lessons from a professional.
D．Practice his instrument.
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