临床疑诊患者为原发性肝癌，首选检查方法是（） A.CT B.核磁共振 C.B超 D.

骨折诊断要点包括（）。

A.骨折的部位

B.骨痂形成

C.有无骨化性肌炎

D.有无畸形愈合

E.有无延迟愈合

有哪些因素共同参与维持角膜的透明性

A．角膜具有屈光度

B．角膜周边免疫活性因子分布高

C．角膜无血管

D．基质层胶原纤维束排列规则

E．角膜内皮层有Na+ -K+ATP酶，可将基质层水分排入前房，使基质层水分含量稳定

阅读理解。

     Sorry to say, our brains naturally start slowing down at the Cruelty young age of 30. It used to be

thought that this couldn't be helped, but new studies show that people of any age can train their brains

to work faster. "Your brain is a learning machine," says University of California scientist Dr. Michael

Merzenich. Given the right tools, we can train our brains to act like they did when we were younger.

All that's required is the practice designed just for the purpose: a few exercises for the mind.

     Merzenich has developed a computer-based training method to speed up the process(过程) in which

the brain deals with information (positscience.com). Since much of the data we receive comes through

     Over the course of training, the program starts asking you to distinguish (辨别) sounds (between "dog"

and "bog", for example) at an increasingly faster speed. It's a bit like tennis instructor, says Merzenich,

hitting balls at you ~faster and faster to keep you challenged (受到挑战). You may start out slow, but before

long you're pretty quick.

     The biggest finding in brain research in the last ten years is that the brain at any age is highly plastic. If

you ask your brain to learn, it will learn. And it may even speed up while in the process.

     To keep your brain young and plastic you can do one of a million new activities that challenge and excite

you: playing table tennis or bridge, doing crossword puzzles, learning a language.... "When it comes to

preventing ageing, you really do 'use it or lose it'," says Barbara Sahakian, professor at Cambridge University.

1. Dr. Merzenich's training method mainly depends on ______.

A. speech training

B. computer languages

C. the activities one joins in

D. the information being dealt with

2. By saying "the brain at any age is highly plastic", the writer probably means the brain can be_____.

A. used

B. mastered

C. developed

D. researched

3. What can we learn from the text?

A. Practice makes a quick mind.

B. Brain research started ten yeas ago.

C. Dr. Merzenich is a scientist in computer.

D. People believed nothing could stop the brain slowing down.

4. Which of the following agrees with the writer's idea?

A. The training methods work better for the old.

B. People should use the brain to stop it from ageing.

C. The training of the brain should start at an early age.

D. It's necessary to take part in as many activities as possible.

草酸的化学式为H₂C₂O₄，甲、乙两位同学对草酸受热分解及其产物的检验分别做了探究：

【猜想与假设】

第一种：草酸分解产物CO₂和H₂

第二种：草酸分解产物是CO₂、CO和H₂O

第三种：草酸的分解产物是______（你猜想的产物化学式）

【设计实验装置】

【实验】

甲同学按其设计的实验装置（如图1）实验时观察到澄清的石灰水变浑浊了…；

乙同学按图2的装置实验也观察到澄清的石灰水变浑浊了，这些现象证明产物中一定有______； 无水CuSO₄变蓝，证明产物中还有______；若产物中有CO，则乙的对应实验现象是______；证明CO生成的化学反应方程式是______．

【结论】

若第二种猜想是正确的，请你写出草酸分解的反应方程式______．

【反思与评价】

（1）乙认为甲设计的实验装置有缺陷：由于试管口向下倾斜，草酸晶体熔点较低，加热到182℃便开始熔化，因此实验中会出现熔融的草酸流进导管而影响后续实验．请你谈谈装置2的至少两点优于装置1的优点：____________．

（2）利用乙设计的装置证明产物中没有H₂的方法是：______．

管理层讨论与分析是上市公司定期报告的重要组成部分。在我国，管理层讨论与分析的披露原则是强制与自愿相结合。( )