单项选择题


A．event
B．incident
C．evidence
D．indication
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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
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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