问题 多项选择题

如果X和Y两种商品的需求交叉弹性为正,那么( )

A.X和Y之间为互补关系

B.X和Y之间为替代关系

C.X价格上升,Y价格也上升

D.X价格下降,Y价格也下降

E.Y价格上升,X商品的需求量上升

答案

参考答案:B,E

解析:交叉弹性值为正,表示两种商品之间为替代关系;交叉弹性是用来衡量一种商品价格的变动对另一种商品需求量变动的影响程度,所以A、C、D不正确。

阅读理解

阅读理解。

     Mr. Turner likes fishing. It is his favorite sport. He often fishes for hours without catching anything.

But this does not worry him. Some fishermen couldn't catch fish. Sometimes they catch old boots or

rubbish ( 靴子或垃圾), Mr. Turner is even worse than the fishermen. He never catches anything-not

even old boots. After he spends the whole morning on the river, he always goes home with an empty

bag.

     "You must give up fishing!" his friend says, "It is a waste ( 浪费 )of time."

      "But they don't realize( 意识到 )one important thing. I'm not really interested in fishing. I am only

interested in sitting in a boat and doing nothing at all. It can make me forget the noise of the city and live

quietly for some time." he always says to himself.

1. Mr Turner always goes fishing because             . 

A. he could sell the fish and get some money

B. he thinks it is a good sport

C. he could cook the fish for supper

D .he could sit in a boat

2. Mr Turner 1ikes to fish .

A. by the river

B. in a boat on the river

C. in the river

D. with other fishermen

3. He always goes home with an empty bag because .

A. he couldn't fish at all

B. there are not any fish in the river

C. he gives the fish to others fishermen

D. he doesn't pay attention to fishing at all

4. His friend tells him when they know he couldn't catch anything.

A. to learn how to fish

B. to change the way fishing

C. not to fish any more

D. to buy some fish

5. From the story we know .

A. Mr. Turner lives in the country

B. Mr. Turner is a good fisherman

C. Mr. Turner is not good at fishing

D. Mr. Turner doesn't like the noise in the city

单项选择题