单项选择题

Mosquitoes are only means of（）of malaria.

A. transference
B. transformation
C. transition
D. transmission

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单项选择题

Lincoln, former president of the Uniterd States, is a conspicuous example of a poor boy who succeeded（）

A. sturdy
B. obstinate
C. permanent
D. manifest

单项选择题

Generous public funding of basic science would （）considerable benefits for the country’s health, wealth and security.

A. lead to
B. result from
C. lie in
D. settle down

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