单项选择题

In recent years the ________ of living has almost double and I can hardly make both ends meet.

A．price
B．charge
C．expense
D．cost
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单项选择题
I found the little boy sitting on the steps, crying _______.
A．heavily
B．strongly
C．bitterly
D．deeply
单项选择题
_______ in the color of sea water from blue to green seem to be caused by high or low concentration of salt.
A．Variations
B．Evaporations
C．Explorations
D．Explosions
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