单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．Because they don’t get much practice with them.
B．Because they often use them in their work.
C．Because they have to pass a test.
D．Because they plan to become doctors.
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单项选择题
A．Income tax is collected from even the poorest citizen.B．State tax is collected from even the poorest citizen.C．Social security tax is collected from even the poorest citizen.D．Sales tax is collected from even the poorest citizen.
A．Income tax is collected from even the poorest citizen.
B．State tax is collected from even the poorest citizen.
C．Social security tax is collected from even the poorest citizen.
D．Sales tax is collected from even the poorest citizen.
填空题
The most astonishing change of attitudes on green movement has taken place amid ______.
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