单项选择题

A．human beings
B．the mystery
C．the sense of smell
D．the space
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单项选择题
A．Long range investments.B．Profitable investments.C．The number of investing countries.D．The number of countries receiving foreign investment.
A．Long range investments.
B．Profitable investments.
C．The number of investing countries.
D．The number of countries receiving foreign investment.
单项选择题
Canada occupies about ______ of the North American continent.
A．1/3
B．1/2
C．1/4
D．1/5
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