C
A white-haired old gentleman steps out of his car, bag in hand and coat over his arm, he has called from the office to say that he is on the way. His wife is preparing supper. He can see the light shining inside his own front door. He looks forward to a fire and hot milk. It is a cold night. A few seconds later he is lying on the icy ground in a pool of his own blood.
　　It doesn't happen very often, but it does happen in the capital city of the United States. It is more likely to happen in the near-deserted city center at night. What happened to him could happen to any of us.
　　Senator Stennis, who is 71 , got out of his white Buick at 7:40 p.m. outside his home at 3609 Cumberland Street. Two youths said, "Get out! Money, please." He followed the order. He handed over his wallet containing several cards, a gold watch and the only money he had in his pockets—twenty-five cents. The youths also said, "Now we're going to shoot you anyway." Anyway they did. One bullet(子弹) hit him in the leg and struck the bone. The other entered his chest just below the upper pocket of his suit. It narrowly missed his heart.
　　Strangely he made it across a ten-meter distance, up eight steps and along twenty more feet of stone path. His wife met him at the door, and saw two men running. The senator told her to call the police and the doctor.
　　The senator is a powerful political figure, but it is unlikely that the two young men knew who he was. More likely the reason for the killing was that he had only no more than a quarter of dollar - not enough for two cups of coffee.
49 According to the passage,_______.
　　A. such a mugging(行凶抢劫) might have happened to anyone
　　B. the mugging happened on a cold evening in a senator's home
　　C. the senator was killed because he was an important politician
　　D. the mugging might not have happened if the senator was young and strong
50. Having robbed the senator, the two young men _______.
　　A. pulled him into a pool 　　 B. shot two bullets into his body
　　C. hit out at him hard 　　　　D. carried him away
51. The two young men were angry by the fact that _______.
　　A. the senator attempted to cheat them
　　B. they failed to get the senator's expensive car
　　C. the senator didn't die in their hands
　　D. the mugging didn't bring them what they had expected
52 Which of the following statements is not true?
　　A. A near-deserted city center at night is a dangerous place.
　　B. People should always carry some money with them.
　　C. Though seriously wounded, the senator managed to get home on his own.
　　D. The senator's wife met the two men and recognized them.

An explosion on Thursday killed one and injured 21 in a busy street in Tongren, Southwest China’s Guizhou Province.

　　The bomb was hidden in a rubbish bin in the city’s commercial hub（商业中心），where lots of shops and restaurants are concentrated.

　　The ear-splitting blast was heard around 12∶50 p.m.，said a local newspaper, citing witnesses. The power of the blast shattered（使粉碎）nearby shop windows and ripped the stainless（不生锈的）steel rubbish can to pieces.

　　One passer-by，identified（确认）only as Zhang，said she was shocked by the noise and saw a lot of pedestrians lying on the ground when she got to the scene.

　　Thirteen of the injured were taken to a local hospital after the explosion. A doctor there said five were in serious condition but already out of danger after emergency treatment. The others were just slightly hurt.

　　The cause of the explosion is still under investigation, said an officer with the Tongren police, but refused to speculate as to the cause.

It can be inferred from the passage that ________.

　　A. All the injured were taken to a hospital

　　B. 8 of the injured were not taken to a hospital

　　C. The rubbish bin with a bomb was in a restaurant

　　D. The rubbish bin with a bomb was in a shop

Which of the following statements is true according to the passage?

　　A. One passer- by, indentified only as Zhang, saw the man throwing a bomb into a bin.

　　B. Some customers in restaurants were injured.

　　C. The writer didn’t get to the scene.

　　D. All customers in shops got hurt.

In the last paragraph the underlined word“ speculate” probably means ________.

　　A. tell　　　　　　　　　　　　　 B. guess

　　C. discuss　　　　　　　　　　　　D. talk

请认真阅读下列短文，并根据所读内容在文章后表格中的空格里填入最恰当的单词。
注意：每空格1个单词。
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.