通过实验的方法，制得并发现了氧气的科学家是[ ] A．法国的拉瓦锡 B．英国的普

根据牙在骨内的深度，完全骨埋伏的阻生称为

A．高位阻生
B．中位阻生
C．低位阻生
D．第Ⅱ类阻生
E．第Ⅲ类阻生

海关规定对在海关注册登记的企业给予10位数代码编号，称为“经营单位代码”。在下列选项中关于10位数代码的组成，说法正确的是( )。

A．地区代码、企业性质代码和顺序代码

B．企业详细地址代码、特殊地区代码、企业性质代码和顺序代码

C．企业所在省、直辖市代码特殊地区代码、企业性质代码和顺序代码

D．企业的属地行政区代码、经济区代码、企业性质代码和企业顺序代码

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

国际咨询工程师联合会(FIDIC)的宗旨是( )。

A．提高会员企业商业利益
B．提高咨询工程师作为社会发展带头人和财富创造者的形象
C．帮助会员解决有关业务实践问题
D．促使会员企业实现商业利益，向各成员协会及至全社会传播有益信息

石英是一种稳定物质，广泛存在于岩石、沙土中。深海沉积物中的石英短时期内不会自生自灭。下图示意北太平洋沉积物中石英含量分布。回答问题。

石英粉尘从源地到达北太平洋主要通过（）

A.大气环流

B.大洋环流

C.水循环

D.岩石圈物质循环