This is a dangerous world we live in. The number of murders goes up every year, people are dying of cancer, more people contract HIV, more teens are using drugs, etc. You know this because you have heard all the statistics on the news and in the paper.  But do you really have an accurate idea what they mean? The numbers are growing up, but how do they compare to the growth in population? Are more cases of these diseases being reported because of better testing techniques, or are the diseases more common? The fact is that without knowing the background statistics mean very little.

This growing trend of reporting only part of the information is becoming dangerous. For example, several years ago a high school student reported the dangers of the chemical known as dihydrogen monoxide. This chemical, found in most cancerous tumors(肿瘤), is often found in the blood of people drunk on alcohol, and causes complete physical and mental dependence for those who take the chemical even once. After reading his report, more than 75% of his Advanced Placement Chemistry class voted to forbid this dangerous chemical! Every one of the above statements is true, yet this chemical is necessary to all life on earth. The students made the mistake because they voted knowing only a few statements and statistics, rather than the chemical’s full background.

The point of this article is that one should be aware of what is and is not being said. When one finds a new fact or number, one should try to consider other important information before forming an opinion with only half-truths. Always remember that the author is trying to convince you of his or her own view, and will leave out information that is different to his view. For example, look again at the statistics that suggest skiing is safe. Only 32 people may die each year when skiing, while 897 die from lightning strikes, but which is really the most dangerous? If you think about it, you realize far fewer people go skiing each year than the number of people who are in danger of a lightning strike. When you think about it, skiing is more dangerous than you might at first think when looking at statistics. If we teenagers are to be left in this world, we had better be able to think critically, and form our own views, rather than be easily persuaded by another’s. To be warned is to be prepared.

In the first paragraph, what problem does the writer want to warn us?

A. We are now living in a dangerous world.

B. We get a lot of false statistics from the media.

C. Statistics alone without full background doesn’t give us an accurate pictures of things.

D. There are around us more and more murders, diseases, etc.

Why does the writer use the example in the second paragraph?

A. To argue that high school students are easily persuaded.

B. To show the danger of reporting only part of the information.

C. To prove what is necessary to us might be dangerous.

D. To warn us of the harmful substance around us.

Relative information is often left out because__________.

A. Relative information is not that important.

B. too much information will make readers feel confused.

C. the author is trying to show what he or she says is true.

D. readers are not able to analyze so much information at once.

What can we learn from the passage?

A. We should learn to think critically and look at problems from all sides.

B. Some measures must be taken to protect our dangerous world.

C. The growing trend of reporting only half-truths is getting out of control.

D. Teenagers ought to improve their ability of telling right from wrong.

Beijing had its biggest snowfall since 1951. Britain is suffering through its longest cold snap (寒潮) since 1981. And freezing weather is hitting the Deep South, including Florida’s orange groves and beaches.

    Whatever happened to global warming?

    Such weather doesn’t seem to fit with warnings from scientists that the Earth is warming because of greenhouse gases. But experts say the cold snap doesn’t contradict global warming at all—it’s just a temporary phenomenon in the long-term heating trend. “It’s part of natural variability,” said Gerald Meehl, a senior scientist. With global warming, he said, “we’ll still have record cold temperatures. We’ll just have fewer of them.”

    Scientists say man-made climate change does have the potential to cause more frequent and more severe weather extremes. But experts did not connect the current cold snap to climate change.

    So what is going on?

“We basically have seen just a big outbreak of Arctic air over populated areas of the Northern Hemisphere”, Arndt said.

In the atmosphere, large rivers of air travel roughly west to east around the globe between the Arctic and the tropics. This air flow acts like a fence to keep Arctic air restricted. But recently, this air flow has become bent into a zigzag (之字形) pattern, wandering north and south. If you live in a place where it brings air up from the south, you get warm weather. In fact, record highs were reported this week in Washington state and Alaska.

But in the eastern United States, like some other unlucky parts of the globe, Arctic air is coming from the north. And that’s how you get a temperature of 3 degrees in Beijing, a reading of minus-42 in mainland Norway, and 18 inches of snow in parts of Britain. The zigzag pattern arises naturally from time to time, but it is not clear why it’s so strong right now.

71.What is the best title of the text?

A. Freezing weather is hitting the Deep South.

B. We’ll still have record cold temperatures.

C. The air flow has become a zigzag pattern.

D. Cold snap doesn’t contradict global warming.

72. With global warming, we will ______.

A. also meet with severe cold snap

B. have more hot temperatures forever

C. never experience cold temperatures

D. have more cold temperatures

73. According to experts, the current cold snap ______.

A. suggests that the climate has changed greatly

B. is not related to the climate change

C. shows that the climate will turn cold

D. is affected by global warming

74. Beijing had its biggest snowfall since 1951 because of ______.

A. a fence from the Arctic                   B. a cooling trend in climate

C. a big outbreak of Arctic air              D. its large population

75. We can conclude that ______.

A. not all the parts of the Northern Hemisphere are cold in face of the cold snap

B. the zigzag pattern arises naturally accidentally

C. Beijing will get cold weather next year

D. Washington state and Alaska will not face cold weather next year

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