根据企业所得税法律制度的规定，下列各项中，属于不征税收入的有( )。 A．财政拨款

不符合高血压的病变是（）

A.细小动脉硬化

B.左心室肥大

C.肾大瘢痕性萎缩

D.视神经盘水肿出血

E.脑出血

2008年7月我国曾对15个副省级城市的公共环境、公共秩序、公益行动等文明指数进行了调查，调查结果公布后，促进了社会文明建设。这说明[ ]

A．社会存在决定于社会意识

B．城市文明建设要突出地方特色

C．社会意识反作用于社会存在

D．社会意识促进社会存在的发展

致热能力最强的是哪种微生物产生的热原（ ）

A．革兰氏阳性杆菌

B．革兰氏阴性杆菌

C．绿脓杆菌

D．金黄色葡萄球菌

E．沙门氏杆菌

B

Unless we spend money to spot and prevent asteroids (小行星) now，one might crash into Earth and destroy life as we know it，say some scientists.

Asteroids are bigger versions of the meteoroids(流星)that race across the night sky. Most orbit the sun far from Earth and don't threaten us. But there are also thousands whose orbits put them on a collision course with Earth.

Buy $ 50 million worth of new telescopes right now. Then spend $ 10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one，the scientists say，we'll have a way to change its course.

Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn't be cheap.

Is it worth it? Two things experts consider when judging any risk are: 1) How likely the event is; and 2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500，000 years. Sounds pretty rare-but if one did fall，it would be the end of the world. “If we don't take care of these big asteroids，they'll take care of us，”says one scientist. “It's that simple.”

The cure，though，might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth? “The world has less to fear from doomsday(毁灭性的) rocks than from a great nuclear fleet set against them，” said a New York Times article.

1. What does the passage say about asteroids and meteoroids?

[ A ]. They are heavenly bodies different in composition.

[ B ].They are heavenly bodies similar in nature.

[ C ].There are more asteroids than meteoroids.

[ D ].Asteroids are more mysterious than meteoroids.

2. We can conclude from the passage that_____ .

[ A ].while pushing asteroids off course nuclear weapons would destroy the world

[ B ].asteroids racing across the night sky are likely to hit Earth in the near future

[ C ].the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime

[ D ].workable solutions still have to be found to prevent a collision of asteroids with Earth.

3. Which of the following best describes the author's tone in this pass age?

[ A ]. Optimistic.  [ B ]. Critical.  [ C ]. Objective.  [ D ]. Arbitrary.

唯有自我认识才能带来自我实现。