单项选择题

The economic reform in that country has been (accelerated).

A．speeded up
B．put off
C．slowed down
D．stopped
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单项选择题
Which of the following substances is not an invader to the body’s immune system
A．disease-causing bacteria
B．disease-causing viruses
C．antigens
D．protein
单项选择题
When he arrived home, he (deposited) his coat on the floor.
A．kept
B．located
C．stored
D．placed
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