关于地球构造的说法正确的是（）。A、地球最外层的地壳平均厚度为33千米 B、地幔的厚度

阅读理解。

     Rock climbing(攀岩) did not become a sport until late in the 1900s. But now it has become a

popular outdoor activity. While rock climbing may still be necessary for mountain climbing, most

people just climb low mountains for fun.

     If you have ever done rock climbing, you will know that it is not a very easy sport. Indoor and

outdoor rock climbing both need practice. What most people don't know is that rock climbing is

one of the sports that depend on your body and mind(意志).

     To climb successfully, one must use wonderful skills(技能). One of the important rules is to

always have three parts of your body on the rock face. Another important rule is that your arms

only hold you close to the rock face while your legs are pushing(推) you up, the closer you are to

the rock face, the easier it is to climb.

     Rock climbing is a wonderful sport. Once you start to learn how to climb, you'll find more fun.

People who like games such as chess playing or problem-solving may love rock climbing, because

they are nearly the same in the way of thinking. For anyone who wants to get into beautiful shape

(体形), rock climbing is a fun and good way. Anyone who enjoys a difficult game and loves the

outdoors should think of taking rock climbing as a new hobby. 

1. When did rock climbing become a sport?

A. In 1900.

B. Early in the 1900s.

C. In the middle of the 1900s.

D. Late in the 1900s. 

2. The chess players may like rock climbing because _____. 

A. they'd like to get into beautiful shape

B. it is more interesting than chess playing

C. it is like chess playing in the way of thinking

D. they really tike to do sports 

3. What can we learn from the passage? 

A. Rock climbing is a kind of indoor and outdoor activity.

B. Rock climbing is a very easy sport.

C. When you climb, your arms push you up.

D. The closer you are to the rock face, the more difficult it is to climb.

广泛溶骨性转移性骨肿瘤可以有（）。

A.血钙升高

B.血磷升高

C.血碱性磷酸酶升高

D.血酸性磷酸酶升高

E.血总蛋白浓度升高

在Word20O3中，选定整个表格后，接Del键，可以（）。

A.删除整个表格

B.清除整个表格的内容

C.删除整个表格的内框线

D.删除整个表格的外框线

下列项目哪些属流动负债（）。

A、预付账款

B、预提费用

C、应付票据

D、预收账款

沉筒式液位调节变送器有哪几种安装形式？