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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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
单项选择题
The more you understand your computer, the ______ it is that you will find out the problems before they occur.
A. more probably
B. more possibly
C. more likely
D. much likely
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