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The author recommends that young people ______.

A．check blood hemoglobin yearly
B．be on a strictly vegetarian diet
C．lose weight
D．do some more studies on hemoglobin
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单项选择题The ratio of the work done by the machine ______ the work done on it is called the efficiency of the machine.

A．against
B．with
C．to
D．for

单项选择题The result of Holmes-Rahe's medical research tells us ______.

A．the way you handle major events may cause stress
B．what should be done to avoid stress
C．what kind of event would cause stress
D．how to cope with sudden changes in life