单项选择题

A．up
B．seriously
C．easily
D．over
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单项选择题
What do many scientists worry about the disease
A．There is no effective way of treating it.
B．It may spread quickly among birds and poultry.
C．It may affect the world economy and politics.
D．It may change to an epidemic among human beings.
单项选择题
A．recentlyB．alreadyC．firmlyD．long
A．recently
B．already
C．firmly
D．long
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