单项选择题

The phrase "signs off on" in the last paragraph is closest in meaning to ______.

A．"signs a contract to build"
B．"accepts the idea of"
C．"agrees to buy"
D．"has got used to"
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单项选择题
No sooner had they sat down ______ they found it was time to leave.
A．when
B．then
C．as
D．than
单项选择题
Scientists generally agree that the Earth's climate will warm up over the next 50 to 100 years ______ it has warmed in the 20000 years since the Ice Age.
A．as soon as
B．as long as
C．as much as
D．as well as
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