单项选择题

When once you have caught the disease, you are immune from it for the rest of your life.

A. free
B. busy
C. calm
D. impatient
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单项选择题
According to many sources, the safest drinking water is from a piped supply.
A. many resources
B. a great deal of information
C. many sausages
D. a great deal of salvage
单项选择题
The room was filled with the scent, of flowers.
A. atmosphere
B. pot
C. feature
D. odor
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