单项选择题

A．doubled
B．reached to $ 7 trillion
C．increased four times
D．increased by $ 7 trillion
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单项选择题
A．10,000 different odorsB．10 different odorsC．1,000 different odorsD．100 different odors
A．10,000 different odors
B．10 different odors
C．1,000 different odors
D．100 different odors
单项选择题
A．industrial noiseB．traffic noiseC．air craft noiseD．noise from children
A．industrial noise
B．traffic noise
C．air craft noise
D．noise from children
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