单项选择题

Albert Einstein, the greatest scientist in the 20th century, once______an offer of $1,000 a minute to speak on the radio.

A. turned down
B. turned up
C. turned out
D. turned in
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Putting money in basic science would ______ considerable benefits for the country's health, wealth and security.
A. lead to
B. result from
C. resulted in
D. lie in
单项选择题
Though he was born and raised in America, he can speak______Chinese.
A. smooth
B. fluent
C. fluid
D. flowing
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