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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单项选择题
At present, China has signed many ______ trade agreements with other countries.
A．comprehensive
B．reciprocal
C．favourable
D．advantageous
单项选择题
The cars were ______ because it was impossible to go any further in the fog.
A．sacrificed
B．transported
C．abandoned
D．removed
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