单项选择题

The price of the organic vegetables will vary according to how far it has to be transported and how expensive the freight ______ are.

A．payment
B．charges
C．funds
D．prices
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单项选择题
Evidence came up ______ specific sounds are recognized by babies as young as six months old.
A．what
B．that
C．which
D．whose
单项选择题
To obtain a satisfactory result, one must apply two ______ of paint on a dean surface.
A．coats
B．levels
C．times
D．courses
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