单项选择题

I found the little boy sitting on the steps, crying _______.

A．heavily
B．strongly
C．bitterly
D．deeply
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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
单项选择题
Shaking hands with the right hand is nothing but a ________.
A．contract
B．convenience
C．convention
D．controversy
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