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
填空题
unmentioned omitted
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