单项选择题

Before they started to work, I asked the worker to give me an ______ of the cost of building the house.

A．assessment
B．estimate
C．evaluation
D．measurement
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单项选择题
I ______ on a book with him. He help me a lot with collecting materials.
A．cooperate
B．operate
C．collate
D．collaborate
单项选择题
Working consistently without rest, a lot of doctors and nurses ______ SARS.
A．go down with
B．go into
C．go for
D．go away
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