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单项选择题
Humans can distinguish about ______.
A．10,000 different odors
B．10 different odors
C．1,000 different odors
D．100 different odors
单项选择题
What should host countries’ proper investment in environment include according to the communique
A．A vigorous private sector.
B．A legal framework.
C．A flexible labor market and prompt service of debt.
D．All above.
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