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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单项选择题
Shaking hands with the right hand is nothing but a ________.
A．contract
B．convenience
C．convention
D．controversy
单项选择题
Although the main characters in the novel are so true to life, they are _______.
A．imaginary
B．imaginative
C．imaginable
D．imagist
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