题目内容
Lightning is a of electrical current from a cloud to the ground or from one cloud to another.
A、rush B、rainbow C、rack D、ribbon
A
In earliest times, men considered lightning to be one of the great mysteries of nature. Some ancient people believed that lightning and thunder were the weapons of the gods.
In reality, lightning is a flow of electricity formed high above the earth. A single flash of lightning 1.6 kilometres long has enough electricity to light one million light bulbs .
The American scientist and statesman, Benjamin Franklin, was the first to show the connection between electricity and lightning in 1752. In the same year he also built the first lightning rod (避雷针). This device protects buildings from being damaged by lightning.
Modern science has discovered that one stroke of lightning has a voltage (电压) of more than 15 million volts (伏特). A flash of lightning between a cloud and the earth may be as long as 13 kilometers, and travel at a speed of 30 million meters per second.
Scientists judge that there are about 2,000 million flashes of lightning per year. Lightning hits the Empire State Building in New York City 30 to 48 times a year. In the United States alone it kills an average of one person every day.
The safest place to be in case of an electrical storm is in a closed car. Outside, one should go to low ground and not get under tress. Also on,e should stay out of water and away from metal fences. Inside a house, people should avoid open doorways and windows and not touch wires or metal things.
With lightning, it is better to be safe than sorry.
【小题1】People once thought lightning came from ________.
| A．the gods | B．the earth |
| C．the sky | D．nature |
| A．Metal fences. | B．Machines. |
| C．Electricity. | D．Lightning rods |
| A．as quickly as water | B．not so quickly as electricity |
| C．at very high speed | D．at very low speed |
| A．In the U.S about one person per day dies from lightning. |
| B．Swimming during a thunder storm is a good idea. |
| C．The Empire State Building frequently gets hit by lightning. |
| D．A closed car is the best place to be during an electrical storm. |
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, ect. You know this because you’ve 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 going 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, 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 statement is true, yet this chemical is necessary to all life on earth. The students made a 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 our information that is different from his view. For example, look again at the statistics that suggest skiing is safe. Only 32 people die each year when skiing, while 897 die from lightening strikes, but which is really more dangerous? If you think more about it, you will realize far fewer people go skiing each year than the number of people in danger of a lightning strike. When you think about it again, skiing is more dangerous than you might at first think when looking at the 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 just to be prepared.
【小题1】What’s the author’s attitude towards the growing trend of reporting only part of the
information?
Disapproving B. Positive C. Indifferent D. Dangerous
【小题2】In the first paragraph, what does the writer suggest?
| A．We are now living in a dangerous world. |
| B．We get a lot of false statistics from the media. |
| C．There are around us more and more murders diseases, ect. |
| D．Statistics alone without full background don’t give us an accurate picture of things. |
| A．To argue that high school students are easily persuaded. |
| B．To prove what is necessary to us might be dangerous. |
| C．To show the danger of reporting only part of the information. |
| D．To warn us of the harmful substance around us. |
| A．it is not important |
| B．the author is trying to show what he or she says is true |
| C．readers will consider other important information |
| D．readers are able to form an opinion with half-truths |
| A．Some measures must be taken to protect our dangerous world. |
| B．The growing trend of reporting only half-truths is getting out of control. |
| C．Teenagers ought to improve their ability of telling right from wrong. |
| D．We should learn to think critically and look at problems from all sides. |