题目内容
The cost of medical care in the United States is very high. The time and money that doctors spend on their medical education are probably one reason for this problem.
A visit to a doctor’s office costs from fifteen to fifty dollars. It is impossible to pay for the medical care they need. Many people in the United States think that doctors are overpaid. Most doctors, however, disagree. They say that they were required to study medicine for a long time. Tuition(学费)for many years of medical education costs a lot of money. Doctors say that it is necessary for most medical students to borrow money from a bank to pay their tuition. Because this money must be repaid to the bank, young doctors need a lot of money for their work. So, they charge people high prices for medical care. Therefore it is possible that the high cost of medical care in America is unnecessary. Because high tuition is one cause of high costs, one way to lower costs would be to have medical schools that are free or have low tuition.
Some people do not have their medical care they need because ______.
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A greenhouse is a building made of glass which is used for keeping plants warm when the outside temperature is how. In a similar way there are several gases in the atmosphere which trap(捕捉) the heat produced by the sun and prevent it from escaping. These gases are known as" greenhouse gases", and the way in which they trap heat in the atmosphere is called the "greenhouse effect". This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere. And without them earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us.
The problem is that in the last century and a half, we have been putting too many of these gases into the earth’s atmosphere by burning large quantities of coal and oil and by cutting down forests. The rapid increase in greenhouse gases is making the world warmer. Tile world's temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide(二氧化碳) in the atmosphere doubles, there will probably be a rise in the earth's temperature of between 1 and 4 degrees. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we're probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, our use of these gases has greatly increased.
"Greenhouse effect" means ______.
The compass(罗盘) is a device that is absolutely necessary for the【56】of ships and airplanes. Hikers often need a compass, too. Anyone who does not use 【57】roads should have a compass.
A compass will always 【58】to know your direction. If you have a map【59】land marks such as roads, mountains, rivers, and lakes, you can immediately find out where you are. The compass 【60】you to place your map in an 【61】position according to the directions. You can then 【62】 where you are with points on the map.
The Chinese were the first people 【63】 the magnet(磁铁)【64】a compass. They first used compasses to 【65】their ships between the years 100 B. C. and A.D. 100. their compasses were simple and 【66】devices.【67】The magnetic iron into their compass, these early seamen placed the magnet on a cork or a piece of straw. They then put the iron-cork system in a bowl of water, the【68】magnet turned easily, aligning(排成列) itself with the directions north and【69】.
Later the Chinese invention was put together【70】a Babylonian invention, the degree. Then the compass became 【71】. Compasses 【72】well on wooden ships.【73】, when metal ships appeared in the 1800s, the simple magnetic compass was【74】. the metal in the ship【75】the magnet. Modem ships now use the gyrocompass and the radio compass for navigation.
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In their letter to the students' representative assembly, the freshmen insisted on in the
Henry built race cars in the 1890’s and even became a race car driver. But he wanted to build cars for everyone: to use, so he began the Ford Motor Company in 1903. He had formulated (制定) a business motto which would be the reason for his success. "The way to make automobiles is to make one automobile like another automobile, to make them all alike." His company declared that they could make automobiles in any color, as long as it was black.
Henry gave much credit to his wife whom he called "The Believer". From the earliest days of their relationship she was the one who encouraged him to build a horseless carriage. Her belief in him was a constant encouragement to produce what would become tile primary mode of transportation in the future.
Henry's greatest task was to produce a gasoline engine that would be the power for his car. He finally produced so many hours each day that his friends called him crazy Henry. tie was inspired to work until his invention would work effectively.
When he designed the Model T, he decided he could build it cheaply for what he called "the great multitude(批量)." To do this he had to design an assemble line where many cars could be bilt in a single day. Each worker would have only his individual parts to put on each car. Then he could limit himself to the few tools needed for the task.
The Model T was introduced in 1908 and began to be produced on an assembly line in 1913. Henry Ford was the major figure in the auto industry for the next fifteen years.
On May 26, 1927, Henry watched the 15 millionth Model T Ford roll off the assembly tine. He had become the richest man in America. He was able to bring the price low enough so that most Americans could buy his car. This gave every family much independence, for they could move about freely without the aid of others’ transporting them.
Because he did not change his Model T, others began experimenting with different types of cars. However, the Ford Motor Company still exists and all car owners are indebted (受惠于) to the creation of the automobile by Henry Ford.
To make cars, Henry first of all needed ______.
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