单项选择题

They stayed up late trying to ______ out a way to solve the problem.

A．let
B．give
C．knock
D．figure
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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 random
B．at will
C．at length
D．in essence
单项选择题
______ indicate that there are more boys than girls attending school.
A．Numbers
B．Statistics
C．Account
D．Calculations
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