1.完形填空 Jack London was an American writer.He was b___ on Jan

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1.完形填空
Jack London was an American writer.He was b___ on January 12th,1876,in America.His family was very poor and Jack had to leave school to make money w___ he was 12.He worked hard in many different j___.
Later Jack went to school again.He was strict with himself and worked hard at all kinds of subjects,especially literature.In 1897,he went to Alaska to look for gold.He found ideas there for his books and stories.He went back home and started to write.His writings were successful,and he became rich and f___ in his twenties.But Jack London was not a h___ man.He ended his own life in 1916.Many American people had a meeting to mourn for him.
2.一副54张扑克牌,从中任意取一张,则抽到A的可能性为___（分数,
3.若一个圆的半径扩大4倍,那么这个圆的面积扩大___ 倍.
4.一个分数的分子缩小2倍,分母扩大4倍,则这个分数就（
A 缩小2倍 B 扩大2倍 C 缩小8倍 D 不变
5.一台织布机6又3分之2 小时内织布38米,照这样的速度,一台织布机昼夜工作,七天可织多少布?（用比例,
6.若半圆的半径为2,则半圆周长C=__；半圆面积S=___
7.圆环外圆半径为R,内圆半径为r,则圆环周长C=__；圆环面积=__（R＞r,保留π）

orned when jobs 后俩得根据选项的吧
2/27 16倍 C
7*24/(6*2/3)*38
都是2π
2πR+2πr πR^2-πr^2

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