A build up of ethylene gas may results in an explosion.
A.
Y
B.
N
C.
NG
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【简答题】The following story took place long ago in Israel.One day when government officials were rebuilding barn(粮仓),they found a mouse hole in a corner and used to force the mice inside the hole to come out....
【简答题】阅读理解。 One day when some government officials were rebuilding a house, they found a mouse hole in a corner and used smoke to make the mice inside the hole come out. A while later they saw mice running ...