Scientists ignored lake Vida because they thought that a lake of ice__________．
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The Substance can be added to gasoline to accelerate（B级）the speed of automobiles．
A. quicken
B. shorten
C. 1ooen
D. enlarg
The first time the author played the violin in the street．he expected
A. he would became a great musician．
B. he would get into trouble．
C. people would be happy t0 give him money．
D. people would stop and listen．
So1diers have to obey（A级）orders．
A. reply to
B. apply for
C. abide with
D. eoillply with
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