脱硫吸收塔内的浆液和烟气中携带的二氧化硫反应后生成了化学性质非常稳定的硫酸钙，因此，

标有“亲启”字样的信函属于（）。

A.一般信函

B.私人信函

C.重要信函

D.紧急信函

Islamabad, Pakistan, June 22^nd---Two mountain climbers surprisingly survived (幸免于) a fall of over 500 feet on the 25,530-foot mountain in Pakistan, Saturday. The two climbers were climbing an ice-covered wall of the mountain when they suddenly lost their footing and fell about 560 feet to a narrow snow-covered ledge(悬崖突出部分) below. “We were lucky that ledge was there,” said the climbers, “Otherwise, we would have fallen over 2,000 feet.” If the ledge had not been there, the two climbers almost certainly have met their death. “It’s a wonder,” the climbers said, “that we landed on the ledge, and the snow was loose enough to cushion(缓冲) our fall. We’re thankful that we survived.”

When a reporter asked them if they planned to give up mountain climbing after their narrow escape(九死一生), the two climbers replied, “Not at all. We’ll be going back up there just as soon as we get out of the hospital.”

小题1: The mountain climbers survived because _____.

A．they had fallen only 500 feet down

B．of the ledge and the loose snow on it

C．of their strong bodies

D．they were very good climbers小题2: If there had not been the snow-covered ledge, _____.

A．they wouldn’t have fallen down

B．they would have them wounded

C．they would have lost their lives

D．they would fall into the deep snow小题3: How high was the ledge from the foot of the mountain?

A．2,560 feet high

B．2,000 feet high

C．25,530 feet high

D．More than 1,400 feet high小题4: Choose the right order which shows what happened to the two climbers.

a. talked with a reporter           b. lost their footing 

c. was sent to a hospital           d. fell to a ledge     

e. started to climb an ice-covered wall

A．b-d-c-e-a

B．e-d-b-c-a

C．e-b-d-c-a

D．a-c-b-d-e

独立学院的办学成本，是指学校在培养学生知识、技能、技巧等各种综合素质过程中所发生的各种耗费。具体包括学院教职员工的工资性支出、学院各部门的行政事业经费支出、学院保证教学活动的正常进行所需要的各种业务支出、校园校舍维护修缮支出、固定资产购建与使用费等内容。对办学成本进行适当的分类，一方面可以为办学成本核算提供具体的成本核算使指标要求，另一方面也为对办学成本进行全面系统的有效控制提供更为有用的信息指标体系。
作者接下来最有可能介绍的是：

A．独立学院的特点
B．独立学院办学成本控制的有效途径
C．独立学院办学成本的分类
D．独立学院的办学成本怎样核算

市场细分

关于颅底骨折，下列哪项是错误的

A．脑脊液漏时若2周不自行停止，即应行手术修补

B．颅后窝骨折可出现Battle征

C．颅中窝骨折可出现耳漏

D．颅前窝骨折可出现"熊猫眼"

E．颅前窝骨折可出现鼻漏