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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填空题
A．nativeB．humanC．physicalD．animal
单项选择题
Relaxed throat muscles block the airway of a sleeping person and leads to his her snoring.
A．Y
B．N
C．NG
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