单项选择题

Bill is an example of a severely disabled person who has become ______ at many survival skills.

A. proficient
B. persistent
C. consistent
D. sufficient
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单项选择题
The old couple now still ______ for their beloved son, 30 years after his death.
A. cherish
B. groan
C. immerse
D. mourn
单项选择题
When a psychologist does a general experiment about the human mind, he selects people ______ and asks them questions.
A. at length
B. at random
C. in essence
D. in bulk
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