单项选择题

A．The density of the water droplets in the air.
B．The size of the water droplets.
C．The temperature of the water droplets.
D．The purity of the water vapor.
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单项选择题
A．It stops working.B．It becomes sharper.C．It confuses odors.D．It detects fewer odors.
A．It stops working.
B．It becomes sharper.
C．It confuses odors.
D．It detects fewer odors.
单项选择题
A．Asking for some financial aid.B．Lending something to a student.C．Reading a student’s application.D．Borrowing money for a business.
A．Asking for some financial aid.
B．Lending something to a student.
C．Reading a student’s application.
D．Borrowing money for a business.
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