题目内容
When many people are worried that there are no more heroes(英雄) in the modern society（当今社会） ,two university（大学） students who lost their lives to rescue（营救）drowning(溺水的)children have shown that heroes still exist（存在）.
According to（根据） the Inner Mongolia Morning Post（内蒙古晨报）, the tragedy（悲剧）occurred on the afternoon of December 14,2002 when three school students skating on a frozen (结冰的) lake in Qingcheng Park in Hohhot（呼和浩特）fell through the ice into the freezing water.
More than 20 university students who happen to be near the spot（地点） immediately went to the rescue of the children,
Two children were quickly rescued, but the third died. The child’s body was not found for three hours. Two of the rescuers, Liu Ye and Hao Longbiao ,also died of cold and exhaustion(筋疲力尽).
The body of Hao who took the lead（ 带领）in jumping into the lake was not found until the next day.A student who was unwilling to tell his name said he and his classmates from the local college were taking photos at the lake. When they heard the children’s cries for help,, they went to the ice hole hand in hand (手拉手)to rescue the children. But the ice kept breaking, causing most of then to fall into the icy water,
Local residents(居民) held mourning ceremonies(祭奠仪式)at the lake.
Eight of the students were seriously affected by the freezing water and were being kept in hospital for further observation（进一步观察）, but their lives were no longer in danger.
【小题1】. The underlined word “occurred” here means
| A．employed | B．mixed | C．guided | D．happened |
| A．skating on the ice | B．taking photos at the lake |
| C．having a picnic | D．walking along the lake |
| A．Three students died on the same day in all. |
| B．Hao Longbiao’s body was found on December 14,2002. |
| C．The university students didn’t think it dangerous to save the drowning children in the lake. |
| D．Local residents were not brave in face of danger. |
| A．people think little of （对----评价低）the two university students’ death |
| B．the ice on the lake wasn’t strong enough to skate on |
| C．some students regrets（后悔） for what they had done |
| D．heroes don’t agree with（与-----一致） the steps（步调） of modern times |
【小题1】. D
【小题1】.B
【小题1】.C
【小题1】.B
解析
名校课堂系列答案Since the 1950s, most of the stars of pop music have come from Britain and America. Howver, in the last ten years, when many different kinds of music have established themselves on the pop scene, more and more stars have come from other countries.
Pop music changes all the time and new stars appear and become famous. For a musician to stay popular and still produced good, original music over a long period of time, is a sign of true star.
Most stars start their careers in a simple way---- playing in unknown night clubs or dance-hall where people want to dance to the music, not listen to it. They may have continued doing this for many years untill they get a “break”---- a chance to perform in a well –known place or get a recording contract. To become a star is the aim of every singer or musician and the dream of many a pop-crazy teenager.
However a group or star makes it to the top, they can be sure that their lives will change once they are successful. Ordinary teenagers living at home with their parents may suddenly find themselves rich enough to buy their own houses. An established superstar may be able to buy several.
Despite the large amount of money that are earned, life at the top is not easy for many stars.. The pop scene is hard work and many stars need to spend a lot of time away from home. For a lot of them, this means they have no home life and their personal relationships suffer. Despite great public success, life at the top can be very lonely.
【小题1】Since the 1950s,most of the stars of pop music have come from______.
| A．America | B．America and Britain |
| C．America and Europe | D．other countries |
| A．perform in a well-known concert | B．get a recording contract |
| C．play in dance-halls | D．meet a lot of pop-crazy teenagers |
| A．will live at home with their parents |
| B．will have an easy life because of the larger amount of money earned |
| C．may have a happy home life and good person relationships |
| D．may have a lonely life |
For years, the automobile industry has been testing vehicles that use hydrogen as fuel. Now, people across the United States have had a chance to see and even drive cars that get power from hydrogen fuel cells (燃料电池).
But the hydrogen fuel cell is not a new idea. The fuel cell was first invented by Sir William Grove of Britain in 1839. Since then, many different designs, have been invented. There is one place where fuel cells are a proven technology: in space. The American space agency used fuel cells in its Apollo spaceships in the twentieth century.
The most useful fuel cell for transportation purposes is the Polymer Electrolyte Membrane, or P.E.M. fuel cell. It is simple and can operate at temperatures of sixty to eighty degrees Celsius. That is much lower than other fuel cell designs. A P.E.M. fuel cell has two sides divided by a thin membrane (膜). Hydrogen gas is forced through one side where it comes in contact with a reactive material containing the metal platinum(铂). The membrane separates the electrons(电子) from the protons(质子) in the hydrogen atoms. The protons pass through it to the other side of the fuel cell. But the electrons are captured to do work; like powering a motor. Oxygen from the air is forced into the other side of the fuel cell. There, the gas meets the protons that have passed through the membrane. They combine to form water and heat. A single fuel cell does not produce a lot of electricity. But when many fuel cells are combined, they can produce enough electricity to power a vehicle. The product of the chemical reaction that powers fuel cells is water. This makes fuel cells a very clean technology.
Hydrogen fuel cell cars have been slow to develop because of many technical problems that have to be solved. For example, it is unclear how long the membranes in P.E.M. fuel cells will last. Also, fuel cells need water for their chemical reactions. They must be designed to start easily at low temperatures and in dry climates. And smaller, less costly fuel cells must be designed before they can truly take the place of gasoline engines. Now more models of fuel cell vehicles are being tested than ever before. The threat of climate change and the high cost of oil have increased interest in these vehicles that do not cause pollution.
|
Title |
More Models of Hydrogen Cars Being Tested |
|
The progress of hydrogen fuel cell |
·(1) ________ by Sir William Grove in 1839. ·Designed (2) ________ ever since. ·Used in Apollo spaceships in the twentieth century. |
|
Operating principle of P.E.M. |
·It has two sides divided by a thin membrane. ·Hydrogen gas from one side (3) ________ the active metal platinum. ·The electrons are (4) ________ from the protons in the hydrogen atoms. ·The protons pass through the fuel cell to the other side. ·Oxygen from the air is (5) ________ into the other side of the fuel cell. ·The gas meets the protons，and then water and heat are(6) ________ |
|
Reasons for slow (7) ________of hydrogen fuel cell cars |
·There are many technical problems (8) ________ ·The durability of the membranes in P.E.M. fuel cells is not clear. ·They have to start easily at (9)________ temperatures and in dry climates. ·They must be smaller and less costly before (10) ________ gasoline engines. |
