[单项选择]Because copper producers are allowed to release harmful chemicals into the air, the industry supply curve is not the marginal social cost curve. Given this situation and a copper market that is otherwise competitive, copper producers will（）
A. produce less than the efficient amount of copper, an example of the "free rider" problem.
B. produce less than the efficient amount of copper, resulting in a dead weight loss from underproduction.
C. produce more than the efficient amount of copper, resulting in a deadweight loss from overproduction.

[单项选择]B．HA＜BA=CA
C．BA＜HA＜CA
D．BA＞HA＞CA
E．HA=BA=CA
甲状腺功能低下
A．HA=BA＜CA(CA：时间年龄，BA：骨龄，HA：身高年龄)

[单项选择]B．HA＜BA=CA
C．BA＜HA＜CA
D．BA＞HA＞CA
E．HA=BA=CA
家族性矮身材
A．HA=BA＜CA(CA：时间年龄，BA：骨龄，HA：身高年龄)

[填空题]Task 7
Hardware Update
Do you frequently have to transfer large files onto disk Do you need to store large files on disk as back up If so, you may be like many users who find their floppies are too small to do the job. A removable storage device may be able to save you time and hassles. Removable storage saves up to one hundred times more data than the floppy disk drive. Many computers come with optional removable storage devices. If your computer does not already have this feature, you can install one for the fairly low cost of about $250. If you frequently save or transfer large files on a disk, a removable storage device may be the answer for you.

What can help you to transfer large files onto disk
A ______ can help you to transfer large files onto disk.

[填空题]Why was smoking not allowed

[单项选择]
Passage 1

According to the local copper in the south London neighborhood of Battersea: a. the people there did not have significant improvement in their housing condition b. the people need to be more open-minded c. the people need to be more civilized d. the people need to have wider access to education

[单项选择]Countries that traditionally never allowed foreign students to stay and work like Germany or the United Kingdom—are facing their own labor ______ in information technology and relaxing their immigration laws.
A. cuts
B. shortages
C. weaknesses
D. imports

[填空题]Ancient Chinese money was made of bronze or copper.

[单项选择]What is the man going to do at Copper Mountain
A. Collecting fossil.
B. Camping.
C. Sightseeing.

[填空题]Iron was used earlier than copper by the early inhabitants of the Americas.

[多项选择] SHOULD COLLEGE STUDENTS BE ALLOWED
TO CHANGE THEIR MAJORS MIDWAY
In the first part of your writing you should present your thesis statement, and in the second part you should support the thesis statement with appropriate details. In the last part you should bring what you have written to a natural conclusion or a summary.
Marks will be awarded for content, organisation, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.
Write your composition on ANSWER SHEET FOUR.

[单项选择]
Who is not allowed on the train
A. (A) Passengers who are late.
B. (B) Passengers with excess luggage.
C. (C) Passengers without reservations.
D. (D) Passengers who don’t pay by check.

[判断题]已知测站点高程为H_A时，则立尺点的高程
H_B=H_A+h=H_A+i-l式中h为两点高差、i为仪器高、l为目标高上式称视准轴水平时的视距测量计算式。( )

[单项选择]关闭表单的程序代码是ThisForm.Release，Release是______。
A. 表单对象的标题
B. 表单对象的属性
C. 表单对象的事件
D. 表单对象的方法