单项选择题

"Viruses waiting for a disease" refers to ______.

A．those viruses carried in the blood of animals
B．some viruses which are at present harmless to man
C．the viruses that reproduce in man without making him ill
D．the still-not-yet-discovered viruses in the jungle

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热门试题

单项选择题

When Dr. Causey said, We have found the loveliest diseases right in our backyard, he meant ______.

A．new viruses have just been discovered
B．his discovery was a bit frightening
C．he and his wife were surrounded by harmful viruses
D．his job was exciting

单项选择题

Although the Reebok Company has solved the problem of fulfilling in orders, it ______.

A．does not want to further expand its retailing network
B．still limits the number of shoes supplied to stores
C．is still particular about who sells its products
D．Still carefully chooses the manufacturers of its products