单项选择题

Cough syrups and cold remedies that are manufactured with alcohol will last much longer than those prepared with water.

A．float
B．finish
C．remain effective
D．be prescribed
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Proper clothes ______ for much in business. That's why you see most business People dress formally.
A．count
B．account
C．allow
D．care
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After years of research, Charles Drew devised a procedure for preserving plasm
A． transportingB. savingC. reusingD. labeling
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