题目内容
Electricity is ________ for modern life．
- A.unnecessary
- B.unpleasant
- C.essential
- D.unknown
In old times，man considered lightning to be one of the great mysteries（神秘事物）of nature．In fact a single flash of lightning 1.6 kilometers long has enough electricity to light one million lamps．
The American scientist，Benjamin Franklin，was the first to suggest that lightning is in fact electricity formed between the earth and clouds high above．It happened in 1752．In the same year，he also built the first lightning rod（避雷针）to protect buildings from being struck by lightnings．
Modern science has discovered that lightning is very strong and powerful．A lightning between a cloud and the earth may be as long as 13 kilometers，and travels at a speed of 30 million meters per second．Scientists have the opinion that there are about 2000 million flashes of lightning per year．In the United States alone，it kills almost one person per day．
The safest place to be in during an electrical（电的）storm is a closed car．Outside，one should go close to low ground for cover and not stop under a tree．Also one should stay out of water and away from metal fences．Inside a house people should keep away from open doorways and windows and not touch wires or metal things．
【小题1】From this passage we know lightning is____．
| A．one of the great mysteries of nature． |
| B．electricity high above the earth． |
| C．a kind of light． |
| D．the sound from the clouds． |
| A．every person can see lightning every day． |
| B．at least one person is killed by lightning every day． |
| C．there are about 6 million flashes of lightning per year． |
| D．about one person per day dies from lightning． |
| A．stand under a tree． |
| B．go outside． |
| C．stay in a closed car． |
| D．stop near windows． |
| A．prevent accidents caused by lightning |
| B．stop lightning |
| C．protect buildings from being washed away． |
| D．delay the coming of lightning |
a speed of ______．
| A．30 kilometres per second． |
| B．3000 kilometres per second |
| C．3 kilometres per second |
| D．30，000 kilometres per second |
Rivers are one of our most important natural resources(资源). Many of the world’s great cities are located on rivers, and almost every country has at least one river running through it that plays an important part in the lives of its people.
Since the beginning of history, people have used rivers for transportation. The longest one in the United States is the Mississippi. The lifeline of Egypt is the Nile. To the people of India, the Ganges is great, but it is also important for transportation; ships can travel along it for a thousand miles. Other great rivers are the Congo in Africa and the Mekong in southeastern Asia. The greatest of all for navigation（航海）, however, is the Amazon in Brazil（巴西）. It is so wide and so deep that large ships can go about two thousand miles up it.
Besides transportation, rivers give food to eat, water to drink, water for crops, and chances for fun. In order to increase the supply(供给) of water for crops, engineers sometimes build a dam (大坝)across a river and let a lake form behind the dam. Then people can use the water not only to irrigate(灌溉) their fields but also to make electricity for their homes and industries.
However, large cities and industries that are located on rivers often cause problems. As the cities grow in size and industries increase in number, the water in the rivers becomes polluted with chemicals and other materials. People are learning the importance, however, of doing more to keep their rivers clean if they want to enjoy the benefits of these natural resources.
【小题1】The greatest river for navigation is ________________.
| A．the Mississippi | B．the Nile |
| C．the Mekong | D．the Amazon |
| A．Many cities are located on rivers. |
| B．Almost every country has at least one important river. |
| C．The Nile is in India. |
| D．Rivers play an important part in the lives of people. |
| A．keeping the rivers clean |
| B．making electricity |
| C．washing clothes |
| D．irrigation and the production of electricity |
| A．people’s drinking water too much |
| B．people’s swimming in the river too much |
| C．chemicals and other materials |
| D．people’s building a dam across a river |
| A．The Importance of Rivers | B．Rivers in Cities |
| C．Transportation | D．Natural Resources |
请阅读下面短文，掌握其意思，然后从方框中所给方的词中选出最恰当的10个，用适当形式填空。（每小题1分，共10分）
| healthy, what, because, ourselves, speech, teach, to, find, isn’t, scientist, that, so |
Our English class is very different from___【小题4】__ in China, more like Chinese class I think! We read lots of books and talked about them, ___【小题5】_ we could understand what we read better. We learned how to know what information is important when we read and what ___【小题6】_ so important. In my class we all gave six ___【小题7】_ to the class during the year. We had to talk in front of the class for six __【小题8】ten minutes!
We also have health classes. In this class, we learned about our bodies and how to take care of ___【小题9】__ by doing things like eating healthy foods, and not doing ___【小题10】__ things like smoking or drugs (毒品). We cooked a little bit, but I was not very good at it!