单项选择题

Jack is a diligent student.

A. hardworking
B. ambitious
C. lazy
D. slow
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单项选择题
His new movie depiets an ambitious American.
A. writes
B. sketches
C. describes
D. indicates
单项选择题
A lot of people could fall ill after drinking contaminated water.
A．boiled
B．polluted
C．mixed
D．sweetened
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