单项选择题

The manufactures hoped that the motor show would boost their car sales.（）

A．add
B．promote
C．lift
D．prompt

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单项选择题

It seems that concentrations of salt cause changes in the colour of sea water.（）

A．fluctuations
B．deviation
C．modifications
D．variations

单项选择题

The clerk had to break off the conversation in order to wait on a customer.（）

A．continue
B．stop
C．hurry
D．begin

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