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

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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
单项选择题
When they asked me to make a speech，I was at a loss for words.（）

A．elated
B．dumb
C．surprised
D．tonguetied
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