GWD-12-Q38:
Outbreaks of Rift Valley fever occur irregularly in East Africa, several years apart. When outbreaks do occur, they kill
thousands of cattle. A livestock vaccine against the disease exists but is rarely used. It is too expensive for farmers
to use routinely, and since it is not effective until a month after vaccination, administering it after an outbreak begins
helps very little. Nevertheless, experts predict that use of the vaccine will increase significantly within the next few years.
Which of the following, if true, provides the strongest justification for the experts’ prediction?
A. Rift Valley fever is spread by mosquitoes, but each outbreak is so widespread that it is impractical
to control it by using insecticides.
B. When an outbreak of Rift Valley fever occurs, unaffected countries often refuse to import livestock from
the countries affected by the outbreak.
C. It would take less than a month for producers of the vaccine to adjust their production operations to cope
with a large increase in demand.
D. Many cattle farmers in East Africa are nomadic or live in remote villages, and such farmers, who have little
access to modern veterinary medicine, are particularly hard hit by outbreaks of Rift Valley fever.
E. Recently published research has shown that certain identifiable climatic conditions are almost invariably
followed, within two to five months, by an outbreak of Rift Valley fever.
加强题。
within 2 to 5 months>1month
只有E有加强的意思。
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