单项选择题

Many words are still ______ to me. I have to look them up in the dictionary.

A．gloomy
B．shadowy
C．miserable
D．obscure
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单项选择题
If you keep on learning like this, you will soon become ______ at many complex skills.
A．persistent
B．proficient
C．consistent
D．sufficient
单项选择题
He is a ______ person. He rarely accepts anybody's opinion without questioning it.
A．obedient
B．skeptical
C．faithful
D．subsidiary
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