单项选择题

A．The tickets are more expensive than expected.
B．The tickets are sold in advance at half price.
C．It’’s difficult to buy the tickets on the spot.
D．It’’s better to buy the tickets beforehand.
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单项选择题
The farmer told the picnickers to leave because he was unfriendly and fault-finding.
A．Y
B．N
C．NG
单项选择题
The estimate is based on the______.
A．direction of the hill
B．accepted speed of sound
C．interval between sound and echo
D．both B and C
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