单项选择题

A．After class today.
B．After today’’s meeting.
C．After class on Friday.
D．Before class on Friday.
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单项选择题
Peter Post believes that___________.
A．the etiquette of sending thank-you cards does good to people and may never die away
B．if we send more thank-you cards, we will receive more in return
C．sending thank-you cards may help people develop a positive attitude toward life
D．we can be greatly rewarded for sending thank-you cards
单项选择题
Technology alone cannot solve the problem of vehicle pollution.
A．Y
B．N
C．NG
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