单项选择题

The incomes of skilled workers went up. ______, unskilled workers saw their earnings fall.

A．Moreover
B．Therefore
C．Meanwhile
D．Otherwise
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单项选择题
John is very______. If he promises to do something he’ll do it.
A．independent
B．confident
C．reliable
D．flexible
单项选择题
Over the past decades, sea ice______in the Arctic as a result of global warming.
A．had decreased
B．more than
C．attach
D．apply
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