单项选择题

______ they invite you to speak, remain silent.

A．Even though
B．Though
C．If
D．Unless
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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
单项选择题
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
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