Why did the country mentioned in the passage suffer from floods and starvation?
A.Because an empire was set up.
B.Because the empire fell to pieces.
C.Because it lost its trees.
D.Because too much had been spent on wars.
第1题
可燃气体和液体蒸气与空气的混合物,遇着火源能够发生爆炸的最低浓度叫做()。
A.爆炸下限
B.爆炸上限
C.爆炸极限
D.爆炸底线
第6题
可燃气体、液体和蒸汽与空气混合物,遇火源能够爆炸的最低浓度叫做()。
A.爆炸下限
B.爆炸上限
C.爆炸极限
D.爆炸底线
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