单项选择题

The cells(电池)were designed to ______ sunshine to electricity to run a motor.

A．convert
B．alter
C．modify
D．exchange
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单项选择题
While walking along the icy river banks, we could see cracks in the ice ______ in all directions.
A．radiating
B．dividing
C．splitting
D．tearing
单项选择题
The jeweler assured Mr. White that the stone was a (n) ______ diamond and not an imitation.
A．graceful
B．genuine
C．actual
D．exact
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