板蓝根抗病原微生物作用的有效成分是( ) A．苦参碱 B．绿原酸 C．栀子苷 D．

马克思指出：“他们战战兢兢地请出亡灵来给他们以帮助，借用他们的名字、口号和衣服，以便穿着这种久受崇敬的服装，用这种借用的语言，演出历史的新场面。”这一观点是评价( )

A．毛 * * 思想

B．康有为的维新变法思想

C．孙中山的旧三民主义

D．新文化前期的指导思想

如图所示是利用塑料瓶、塑料管、橡皮塞等材料制作的小喷泉装置．其中A是用一个塑料瓶割去瓶底部分后留下的瓶嘴部分．B、C是两个侧壁上有一个圆孔的塑料瓶．先把图示中B瓶装满水，C瓶不加水，再往A中加一些水，不要让水没过喷嘴．当A中的水流到C中时，就可以看到喷泉了．

（1）设大气压强为P₀，水的密度为ρ，已知h₁、h₂，则B中液面处的压强为______．

（2）假设在喷嘴处安装足够长D管，水柱不会从D管中喷出．设到D管中水面静止时，其增加水量的体积△V，A、B、C瓶中的水将通过管子流动，则水从B移至D中，重力势能增加量△E₂为______．

（3）由此可知，D中的水柱将上下振动，最后D中的水面将停在距A中水面______处．

（已知A、B、C瓶子的横截面积比D管的横截面积大很多且水面静止后A、B、C中都有水）

Accidents happen, but when they destroy the delicate balance of nature and cause the whole world to suffer, they become disasters, and we  should do all we can to prevent them from happening again.

Bhopal chemical leak, December 1984, Bhopal, India

An explosion in the Union Carbide chemical plant in Bhopal, India, released a deadly gas called methyl (甲基) isocyanate(异氰盐酸), which is used to make pesticides. The gas formed a cloud that killed 2500 people; another 50000- 100000 people became ill. Trees and plants in the area became yellow and brittle. The explosion was caused by a mechanical failure that was not noticed in time to stop it.

Exxon Valdez oil spill, March 1989, Alaska, U.S.

On March 24, 1989, 11 million gallons of crude oil spilled into Prince William Sound from the tanker Exxon Valdez when its hull hit a reef and tore open. The oil, which is not yet cleaned up after billions of dollars have been spent and the millions of birds, fish, and other wildlife have died, was caused by human error and could have been avoided.

Chernobyl, April 1986, USSR

At 1:23 A.M. on Saturday, April 26, 1986, the reactor blew at nuclear power plant in Chernobyl, ripping open the core, blowing the roof off the building, starting more than 30 fires, and allowing radioactive material to leak into the air. Some 31 people were killed and 200 people were treated for radiation poisoning. Still at risk are 135000 people from the 179 villages within 20 miles, of the plant who were exposed to the radiation before being evacuated. Glaring violations of safety rules were at the bottom of this tragic event.

Love Canal, 1953, New York, U.S.

Love Canal, a small town in upstate New York near Niagara Falls, was destroyed by waste from chemical plants. Beginning in 1947, chemical companies could legally dump their waste products into the canal. The area developed a foul smell, trees lost their bark, and leaves fell throughout the year. A health survey found that the drinking water contained excessive levels of 82 industrial chemicals, 7 of which were thought to cause cancer. The people of Love Canal had an unusually high rate of cancer and birth defects. Eventually, many of the houses had to be abandoned. Today, the town has been partly cleaned up and some families have moved back to the area.

Three Mile Island, 1979, Pennsylvania, U.S.

On March 28, 1979, the worst accident in U.S. nuclear reactor history occurred at the Three Mile Island power station, near Harrisburg, Pennsylvania. No one was killed, and very little radioactivity was released into the air when coolant (the fluid that keeps a machine cool) escaped from the reactor core due to a combination of mechanical failure and human error. After 10 years and $ 1 billion in cleanup costs, the lower extremes of the reactor are still so radioactive that workers must use remote - control equipment to remove the remaining fragment of fuel core.

小题1:This passage mainly discusses_______.

A．accidents that affected many living things

B．air pollution

C．water pollution

D．what people are doing to prevent environmental disasters小题2:You can infer from the passage that the Bhopal Chemical leak_______.

A．happen at night

B．was the worst accident in the history of India

C．caused more deaths than sicknesses

D．could have been avoided小题3: It can be inferred from the passage that the people in Love Canal_______.

A．didn’t know that chemical companies were dumping waste products into the canal

B．didn’t know that their water was becoming dangerous to drink

C．tried to stop companies from dumping their waste products into the canal

D．didn’t mind that chemical companies were dumping waste products into the canal小题4:The best title for the article is ________.                                                                       A. Accidents in Some Countries    B. Disasters in Some Countries

C. Our Earth Is Out of Control         D How to Prevent Accidents from Happening Again

以下哪项是板层状鱼鳞病的典型皮损为（）

A.全身皮肤角化过度

B.黄棕色四方形鳞屑，遍及体表

C.全身皮肤潮红，有大片状鳞屑

D.黄褐色或污黑色大片鱼鳞状鳞屑

（）是现代文明国家的基本特征，其核心价值体现在对公权力的有效支配，这是公认的迄今为止控制公权力的最好方式。

A、法治

B、民主

C、宪法

D、人治