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同类题1

In America, there are chores(杂活) for children of different ages. American people think that it's important to tell children their duty in the family.

Ages 4-6

Ages 6-12

Ages 13 and Up

-Make their bed;

-Clear dishes from the table;

-Set the table;

-Get the mail from the mailbox;

-Take care of pets;

-Cook simple food;

-Help wash the car;

-Vacuum(吸尘) and sweep;

-Take out the rubbish.

-Wash windows;

-Clean out fridge;

-Prepare a meal;

-Make shopping lists;

-Mow the lawn(剪草坪)

同类题2

下面是某化学兴趣小组的同学对氢氧化钠部分性质的探究过程：

同类题3

等底等高的圆柱和圆锥，圆柱的体积是12立方分米，则圆锥的体积是____．如果圆锥的体积是12立方分米，则圆柱的体积是____．

同类题4

根据材料内容，选择正确答案。

同类题5

\frac{1}{3}

的相反数是____．

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