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
Which of the following, according to the author, should play the leading role in the solution of environmental problems
A．Legislation and government intervention.
B．The industry’s understanding and support.
C．The efforts of environmental health professionals.
D．The cooperation of ecologists, environmental activists and conservationists.
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填空题
Why did Jackie think Andrew was making up the story
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