单项选择题

A．Because it’’s prohibited by the government.
B．Because it’’s more inefficient than other alternative fuels.
C．Because it will destroy the ozone.
D．Because it costs a lot to mass-produce.
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单项选择题
A．Decaffeinated coffee may help prevent heart disease.B．Coffee does not necessarily cause heart disease.C．Coffee has less caffeine than soda.D．Caffeine can be used as headache remedy.
A．Decaffeinated coffee may help prevent heart disease.
B．Coffee does not necessarily cause heart disease.
C．Coffee has less caffeine than soda.
D．Caffeine can be used as headache remedy.
单项选择题
A．To see what happened to the survivors of the disease.B．To study animals that can also get infected with the disease.C．To look for the plants that could cure the disease.D．To look for the plants that could cure the disease.
A．To see what happened to the survivors of the disease.
B．To study animals that can also get infected with the disease.
C．To look for the plants that could cure the disease.
D．To look for the plants that could cure the disease.
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