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
______ they invite you to speak, remain silent.
A. Even though
B. Though
C. If
D. Unless
单项选择题
______ is the question nobody can answer.
A. From where is he
B. Where he is from
C. Where is he from
D. He is from where
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