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.

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热门试题

单项选择题

Secretary Leavitt stressed ______ in the process of fighting HSN1 bird flu virus.

A．research and development of new medicine
B．new devices of prevention
C．separation of infectors
D．surveillance and information exchange

单项选择题

Some European retailers warned that they would ______, if their stock isn't released soon.

A．close their stores
B．resort to legal action
C．take on a strike
D．take some violent actions