题目内容
听力原文：W: How are the pictures you took in New York？ Jack told me they were wonderful, and I can't wait to see them.
M: I'm glad to hear that. But I'm sorry that the pictures are not ready yet.
Q: What does the man mean？
(16)
查看答案
搜索结果不匹配？点我反馈
更多问题
A．He lacks time.B．He lacks willpower.C．He lacks sleep.D．He lacks medicine.
Ironically, the first evidence for this idea appeared in the United States. Not long ago, with the country entering a recessing and Japan at its pre-bubble peak. The U. S. workforce was derided as poorly educated and one of primary cause of the poor U. S. economic performance. Japan was, and remains, the global leader in automotive-assembly productivity. Yet the research revealed that the U. S. factories of Honda Nissan, and Toyota achieved about 95 percent of the productivity of their Japanese counterparts a result of the training that U. S. workers received on the job.
More recently, while examing housing construction, the researchers discovered that illiterate, non-English-speaking Mexican workers in Houston, Texas, consistently met best-practice labor productivity standards despite the complexity of the building industry's work.
What is the real relationship between education and economic development？ We have to suspect that continuing economic growth promotes the development of education even when governments don't force it. After ail, that's how education got started. When our ancestors were hunters and gatherers 10, 000 years ago, they didn't have time to wonder much about anything besides finding food. only when humanity began to get its food in a more productive way was there time for other things.
As education improved, humanity's productivity potential, they could in turn afford more education. This increasingly high level of education is probably a necessary, but not a sufficient, condition for the complex political systems required by advanced economic performance. Thus poor countries might not be able to escape their poverty traps without political changes that may be possible only with broader formal education. A lack of formal education, however, doesn't constrain the ability of the developing world's workforce to substantially improve productivity to the forested future. on the contrary, constraints on improving productivity explain why education isn't developing more quickly there than it is.
The author holds in paragraph 1 that the important of education in poor countries ______.
The Killer Smog
Cases of Killer Smogs
On the night of December 1st, 1930, a dense fog moved over the Meuse Valley, in Belgium. Many factories in the valley poured smoke and fumes into the foggy air. This created dark smog of smoke and fog combined. People in the valley began to cough and strain for breath. The smog remained for four days. During that time, thousands of people became ill. The hospitals were filled with patients. Sixty people died. Most of them were older persons with heart and lung problems. Finally, a heavy rain washed away the smog. Scientists studied the causes of the disaster. They concluded that the illnesses and deaths were caused by chemicals in the smog.
The first reported event of this kind in the United States happened in Donora, a factory town in a valley near Pittsburgh. In 1948, a killer smog made half of the population sick; there were 17 deaths. Again, older people with lung or heart diseases were hit hardest.
London, England, has always been known for its "black fogs". In the winter of 1952, a milky white fog rolled into the city. It soon turned into black smog as the smoke of the city poured into the air. It was so hard to see that people had to walk in front of the buses to guide them. In this way, the most serious air pollution disaster in history began. When it was over, more than 4,000 people had been killed by the thick black smog.
New York City has had several types of smogs since 1950. Each time, there were from 100 to 400 deaths caused by the smog. Although these smogs were not as deadly as London's, New York City has the worst air pollution problem in the United States.
Causes of Killer Smogs
In all the killer smogs, factories and homes poured smoke and fumes into the air from the furnaces. The chemical fumes combined with the water droplets in the fog to form. harmful substances. These substances caused the illness of those who breathed the polluted air.
Usually, such harmful fumes rise into the upper air and are blown away by the wind. But sometimes there is an unusual weather condition called a temperature inversion. A layer of cold air remains near the ground as smoke and fumes pour into it. This is covered by an upper layer of warm air that acts like a lid. It prevents the polluted cooler air from rising. The harmful fumes pile up and make people ill. These fumes contain sulfur dioxide, soot particles, and other chemicals. The smog may be so thick that airports are closed and chains of collisions occur on the highways.
Another type of smog occurs in Los Angeles. Here the weather may be clear and sunny. But stinging eyes and dry coughs show that harmful chemicals fill the air. The smog is due to invisible gases, mostly from automobile exhausts. Because these chemicals are changed by the sun high up in the air, Los Angeles smog is called photochemical smog. It contains automobile exhaust fumes and nitrogen oxides changed by the sun's rays. Added to these are sulfur dioxide and other fumes from factories and oil refineries. Photochemical smog is found in many large cities all over the world.
Harmful Substances Found in Smogs
Killer smogs don't happen very often, fortunately. But in many large cities, a combination of automobile exhaust fumes, home furnace smoke, and factory waste gases pours into the air. This may also happen in the suburbs, or out in the country, where large factories have been built. A number of harmful substances have been found in the air there. When these substances are breathed in day after day, the health of the population is affected.
Sulfur dioxide is formed when fuels containing sulfur are burned. The sulfur combines with the oxygen in the air to form. sulfur dioxide. This gas probably caused most of the deaths in the killer smogs. It combines with the water droplets in the air, o
The automobile is now the main cause of air pollution.
微信支付 
支付宝支付