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【单选题】
The cruel man________his wife and child. [     ]
A.
abandoned
B.
involved
C.
appointed
D.
tolerated
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【单选题】No brave men lie down on the _____ of history to wait for the train of the future to run over them. [     ]
A.
periods
B.
tracks
C.
stages
D.
positions
【简答题】We use water to ____( 灭火 )
【单选题】当线性规划的一个基本解符合下列哪项要求时称之为基本可行解()。
A.
大于 0
B.
小于 0
C.
非负
D.
非正
【简答题】we use water to____(做晚饭 )
【简答题】We use water to ___( 种庄稼)
【单选题】Everybody needs water. Everything  16  water,too. We use water  17  the bowls, the clothes, and  18  .We use water to plant trees, flowers and crops.  19  does all water come from? It  20  from clouds...
A.
on        
B.
into        
C.
going      D to go 小题9: A.into B.on C.it D.its 小题10: A.here B.there C.to D.down
【简答题】We use water to ____( 洗手 )
【单选题】当线性规划的一个基本解符合下列( )要求时,称为基本可行解。
A.
等于0
B.
小于0
C.
非正
D.
非负
【简答题】We are safe neither at home nor in the business office.We use water in both places.Our local water supply added chemicals into the water to kill harmful bacteria.But the chemicals can cause harm to pe...
【简答题】We use water to ____(洗衣服 )
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