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【单选题】
The discovery of dinosaur fossil sites in Bolivia is exciting because of the following reasons EXCEPT ______.A.
they are found in continent other than Asia and North Continent
B.
the largest dinosaurs in the world are found in this discovery
C.
there are some unknown species of dinosaurs found this time
D.
the dinosaurs were believed to be some of the last ones on earth
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【单选题】The machine will continue to make much noise ___ we have it repaired.
A.
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unless
【单选题】The machine will continue to make much noise ______we have it repaired.
A.
when
B.
because
C.
if
D.
unless
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【单选题】Volts from the Sky Lightning has caused awe and wonder since old times. Although Benjamin Franklin demonstrated lightning as an enormous electrical discharge more than 200 years ago, many puzzles stil...
A.
Cloud-to-ground lightening occurring in the US
B.
Types of lightening
C.
Cause of lightening
D.
Differences between thunder and thunderstorm
E.
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