单项选择题

Distinctive sound refers to _______.

A．allomorph
B．phoneme
C．phone
D．minimal pairs
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单项选择题
As soon as person gets threshold pains , he should _______.
A．telephone the doctor immediately
B．first relieve the stress and tension which cause the pains
C．wait to let the pains reach a certain point
D．take pain-killer
单项选择题
Some people suffering from a pain do not go to hospital because _______.
A．they are horrified to get the bad news
B．they think no medicine is effective
C．they think the pain will disappear as soon as you forget it
D．they are too busy
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