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【单选题】
吸烟不慎引起的火灾在饭店火灾中居首位，比例达（）以上。A.
20%
B.
30%
C.
40%
D.
50%
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举一反三
【简答题】Billy and Bobby were small boys. They were brothers, and they often fought each other. Last Saturday their mother said to them, “I’m going to cook our lunch now, go out and play in the garden……and be ...
【简答题】横线里最大能填几？ ______×6＜49 8×______＜63 ______×5＜44．
【单选题】加权算术平均数的大小受各组( )
A.
次数（f）的影响最大;
B.
标志值（x）的影响最大
C.
权数（f／Σf）的影响最大t;
D.
标志值（x）和次数（f）的共同影响
【单选题】_____ the _____ of modern industry, the pollution is becoming more and more serious.A．With; deve
A.
44. _____ the _____ of modern industry, the pollution is becoming more and more serious. A．With; developing
B.
Under; development
C.
With; development
D.
Under; developing
【简答题】slip; slide; glide Canadians living in that area often wear snowshoes in winter to avoid ___. He quickly ___ down the tree when the bear went out of sight. It's a lot of fun ___ down the sand hill. It...
【简答题】A． schools B． classes C． meals D． students
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