单项选择题

A．Commodities
B．Necessities
C．Opportunities
D．Products
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单项选择题
A．applicationsB．discoveriesC．inventionsD．innovations
A．applications
B．discoveries
C．inventions
D．innovations
单项选择题
A．wheneverB．whereverC．whateverD．however
A．whenever
B．wherever
C．whatever
D．however
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