多少把椅子（）

A.What(什么)

B.Who(谁)

C.why(为什么)

D.How many(多少)

E.How(如何做)

A.How many pens do you have

B.How many crayons do you have

C.How many crayon

A.How many pencils are there in your class

B.How many pens do you have

C.How many pencils do you have

How many countries will take part in the 2008 Olympic Games？

A.多少国家加入 2008奥运会？

B.多少国家参与奥运会的工作？

C.多少国家参加 2008奥运会？

A.What have you got

B.How many pens

How many days did you stay in Beijing？

A.你在北京呆了多少天？

B.你已在北京生活了多久？

C.你将在北京住几天？

假设需求曲线是D(p)=100-2p，如果垄断者有60套住房，他会定什么价格？他可以租出多少套？如果他有40套住房，他会定什么价格？他可以租出多少套？

Suppose the demand curve is D(p) =100-2p.What price would the monopolist set if he had 60 apartments？How many would he rent？What price would he set if he had 40 apartments？How many would he rent？