燃烧室是固体废物焚烧系统的核心.

由于血管壁内皮细胞和纤维母细胞增生而导致（）

A.血管腔狭窄

B.流增速

C.管数量明显减少（指、趾）

D.血流淤滞

E.血栓形成

Windows中，文件夹的组织结构是一种( )。

A．表格结构

B．树形结构

C．网状结构

D．线性结构

阅读理解。

     America hopes to start building a base that can continue to exist all the time on the moon within 20 years.

By the mid-2020s, astronauts will be staying there for six months a time. So what do scientists think food

and water will be like for those first moon residents?

     In the short term, food would have to be brought from Earth. The dream, however, is to grow things in

greenhouses on the moon. "You'd grow things in the liquid-there's no reason why that wouldn't work," says

Pillinger, a professor. This would mean floating plants in a nutrient-rich solution of water. "Soil is not a

necessary thing for plants; it's only to keep them standing upright," Pillinger adds.

     It would take at least a decade of experiments after the base was built before such a plan would work,

however. The main problem is working out how to get nutrients from the lunar soil. "Getting all that to work

requires a minimum level of infrastructure (基础设施) present before you can start experimenting with

greenhouses," says Pillinger.

     Finding strong plants to grow in space will also be hard, though scientists are already working on it:

scientist Amy Grunden of North Carolina State University has been working on genetically engineering food

crops that can be grown in harsh, off-planet environments.

     Water is a somewhat easier prospect (前景). One of the reasons that America wants to put its base at

the moon's south pole is that it thinks that, in the permanently shaded craters, there are large pools of frozen

water. If that's true, it could easily be mined and used to drink and to create oxygen for the habitants.

1. The passage is mainly about _____.

A. life on the moon by 2020

B. America's first moon base that exists forever

C. food and water on the future moon base

D. housing for settlers on the future moon base

2. How do people plant on the moon in the future?

A. By burying plants in the lunar soil.

B. By growing plants in water.

C. By keeping plants standing straight.

D. By making use of the moonlight.

3. What difficulty will scientists meet in solving the food problem?

A. How to find water to irrigate plants.

B. Where to experiment with plants.

C. How to grow plants in the moon soil.

D. What plants are suitable to grow on the moon.

4. Scientists want to build the base on the moon's south pole because _____.

A. there is oxygen for people to breathe

B. people have found the frozen water that can be drunk there

C. it is a place where water will possibly be found and supplied

D. there are large pools that can let people have a swim

病人开口困难，有走马疳史，X线摄片关节正常，此病人应为（）

A.颞下颌关节强直

B.咀嚼肌痉挛

C.破伤风牙关紧闭

D.颌间瘢痕挛缩

E.癔病性牙关紧闭

最基本的失业保险待遇是（）。

A、职业培训补贴

B、医疗补助金

C、职业介绍补贴

D、失业保险金