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问题 单项选择题

以差别产品的价格竞争模型为例，寡头1的需求函数为Q1=12-2P1+P2；寡头1的成本为C寡头2的需求函数为Q2=12-2P2+P1；寡头2的成本为C2=20；在无勾结的情况下，两寡头的价格为（）.

A.P1=P2=6

B.P1=P2=5

C.P1=P2=4

D.P1=P2=3

答案

参考答案：C

单项选择题

后牙锁牙合属哪个方向的不调 （）

A.矢状向不调

B.横向不调

C.垂直向不调

D.矢状向不调伴垂直向不调

E.矢状向不调伴横向不调
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阅读理解
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King’s College Summer School
King’s College Summer School is an annual(每年的) training program for high school students at all levels who want to improve their English. Courses are given by the teachers of King’s College and other colleges in New York. Trips to museums and culture centers are also organized. This year’s summer school will be from July 25 to August 15. More information is as follows:
Application (申请) date
·Students in New York should send their
applications before July 18, 2007.
·Students of other cities should send their applications before July 16, 2007.
·Foreign students should send their
applications before July 10, 2007.
Courses
·English Language
Spoken English: 22 hours
Reading and, Writing: 10 hours
·American History: 16 hours
·American Culture: 16 hours
Steps
· A letter of self-introduction
· A letter of recommendation(推荐)
· The letters should be written in English with all the necessary information.
Cost
·Daily lessons: $200
·Sports and activities: $100
·Travels: $200
·Hotel service: $400
·You may choose to live with your
friends or relatives in the same city.
Please write to:
Thompson, Sanders
1026 King’s Street
New York, NY 10016, USA
E-mail: KC-Summer-School@ yahoo.com
 
60. You can most probably read the text in ___________.
A. a newspaper      B. a travel guide    C. a textbook      D. a telephone book
61. Which of the following is true about King’s College Summer School?
A. Only top students can take part in the program.
B. King’s College Summer School is run every other year.
C. Visits to museums and culture centers are part of the program.
D. Only the teachers of King’s College give courses.
62. If you are to live with your relatives in New York, you will have to pay the school__________.
A. $200             B. $400            C. $500             D. $900
63. What information can you get from the text?
A. The program will last two months.
B. You can write to Thompson only in English.
C. As a Chinese student, you can send your application on July 14, 2007.
D. You can get in touch with the school by e-mail or by telephone.
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