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阅读理解。

      John is twelve years old. His sister, Mary, is two years younger than he is. One day, their mother asks them

to clean the house. Because they do a good job, their mother buys a delicious cake and says to John, "John, cut

this cake into two pieces, and give one piece to your sister. Don't forget that you must do it like a brother."

      "Like a good brother?" John asks. "How does a good brother do?" "He always gives the bigger piece to the

other person," answers the mother. 

      "Oh, I see," says John. He thinks about this for a short time, and then take the cake to his sister and said to

her, "Please cut the cake into two, Mary, and be a good sister."

1. John is _______ old. [ ]

A. twelve years

B. ten years

C. two years

D. one year

2. _______ clean the house well. [ ]

A. John

B. Mary

C. Brother

D. Both John and Mary

3. At last John asks _______ to cut the cake. [ ]

A. his mother

B. his sister

C. John

D. them

4. _______ wants a bigger piece of the cake. [ ]

A. John

B. Mary

C. His mother

D. Nobody

5. In this story there are only _______ people. [ ]

A. two

B. three

C. four

D. five

火力发电厂中，汽轮机是将（）的设备。

A、热能转变为动能；

B、热能转变为电能；

C、机械能转变为电能；

D、热能转换为机械能。

甲公司拥有乙公司80%的有表决权股份，能够控制乙公司的财务和经营决策。2012年9月甲公司以800万元将一批自产产品销售给乙公司，该批产品在甲公司的生产成本为600万元。至2012年12月31日，乙公司对外销售该批商品的60%，假定涉及的商品未发生减值。甲、乙公司适用的所得税税率均为25%，且在未来期间预计不会发生变化。税法规定，企业的存货以历史成本作为计税基础。
要求：根据上述资料，不考虑其他因素，回答下列问题。

2012年12月31日合并报表中上述存货列示的金额为( )万元。

A．240
B．320
C．80
D．600

转子弯曲分为（）和（）两种。

下列有关跨商品套利的说法，正确的是（）。

A.跨商品套利仅仅是对一种商品的操作

B.跨商品交易是套利交易中最为简单的类型

C.跨商品套利的风险较低

D.出现套利机会的概率较大