单项选择题

A．A delicate art.
B．A religion.
C．An exact science.
D．A way of life.
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单项选择题
A．He wanted Mary to come, but she couldn’t.B．He invited Mary to the party.C．He didn’t invite Mary to the party.D．He didn’t want to have a party because of business.
A．He wanted Mary to come, but she couldn’t.
B．He invited Mary to the party.
C．He didn’t invite Mary to the party.
D．He didn’t want to have a party because of business.
填空题
Scientists have established an international network called ______ to monitor flu in the world.
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