单项选择题

When stimulated, the sympathetic branch leading to the muscles in the heart cause the heart to beat more rapidly and vigorously .

A．cryptically
B．chilly
C．energetically
D．feebly
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When myocardial infarction happens, there may be a burningsensationsimilar to indigestion or heart bum.
A．sensitivity
B．sensibility
C．sense
D．sensor
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Plastic bags are useful for holding many kinds of food,by means oftheir cleanness, toughness and low cost.
A．by virtue of
B．in addition to
C．for the sake of
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