Food sometimes gets poisoned with harmful things. A person who eats such food can get an illness called food poisoning. Food poisoning is usually not serious, but some types are deadly. The symptoms of food poisoning usually begin within hours of eating the poisoned food. Fever is one of the most common symptoms.
Certain microorganisms(微生物)cause most types of food poisoning. Bacteria and other microorganisms can poison eggs, meat, vegetables, and many other foods. After entering the body, these tiny living things release(释放)poisons that make people sick.
Some chemicals can also cause food poisoning. They are often added to food while it is being grown, processed, or prepared. For example, many farmers spray chemicals on crops to kill weeds and insects. Some people may have a bad reaction to those chemicals when they eat the crops.
Some plants and animals contain natural poisons that are harmful to people. These include certain kinds of seafood, grains, nuts, seeds, beans, and mushrooms.
When people handle food properly, the risk of food poisoning is very small. Microorganisms multiply rapidly in dirty places and in warm temperatures. This means that people should never touch food with dirty hands or put food on unwashed surfaces. Food should be kept in a refrigerator to stop microorganisms from growing. Meat needs to be cooked thoroughly to kill any dangerous microorganisms. People should also wash food covered with chemicals before eating it. Finally, people should not eat wild mushrooms or other foods that grow in the wild. Some of these foods may contain natural materials that are poisonous to humans. In addition, some types of fish can be poisonous.
Most people recover from food poisoning after a few days of resting and drinking extra water. If people eat natural poisons, they must go to the hospital right away to have their stomachs emptied.
67. Which of the following statements is NOT true?
A. Food when poisoned can make people sick.
B. Food poisoning means death.
C. Food poisoning comes in varieties.
D. Food poisoning can be serious.
68. Food poisoning can be caused by all the following EXCEPT ________.
A. some chemicals B. low temperatures
C. some tiny living things D. certain natural materials
69. From Paragraph 5,we can learn that ______________.
A. mushrooms should not be eaten
B. vegetables are safer than meat and seafood
C. natural poisons are more dangerous than chemicals
D. different types of food should be handled differently
70. It can be inferred from the passage that____________ .
A. natural materials are safe in food processing
B. chemicals are needed in food processing
C. food poisoning can be kept under control
D. food poisoning is out of control
In the last few years the Internet has become a widespread phenomenon(现象) around the world.People have started to use the computers just like they used to watch TV. Whenever we get hungry,we simply order a pizza through the Internet and while we are waiting for the food,we can send an important business e-mail concerning some sales for tomorrow.It is,in fact,very comfortable to just simply sit down and have a chat with somebody from South Africa about fishing and get some important advice.Sometimes when you are sad and are feeling lonely,if you go o
n the Internet,you can find good entertainment that will keep you busy.
To make a long story short,we just don’t have the time to communicate with people in person anymore.Besides,there is so much information easy to get on the Internet that when we start surfing,we find it hard for us to get away from the computer.There are a lot of people who are addicted(沉溺于) to TV and watch it 5 to 7 hours a day,while recently addiction to the Internet has become a very serious problem.You might think that these kinds of things could never happen to you,but it is not really true.To prevent yourself from getting addicted,the most important thing is to make sure that you are not spending too much time in front of the screen.Although it might seem to be easy to pull yourself away from the Web,it is simply not the case.You might have to make an effort to place some limits(限制) on yourself.The first paragraph of the text mainly tells us that.
| A．it is nice to have a Net friend from South Africa |
| B．the Internet can help us to do business |
| C．some people prefer surfing the Internet to watching TV |
| D．the Internet can make our life more convenient |
To avoid getting addicted to the Internet,we should.
| A．watch TV more hours a day instead |
| B．limit our time in front of the screen |
| C．communicate with people face to face |
| D．entertain ourselves in other ways |
From the passage,we can infer that the writer.
| A．has once been addicted to the Net |
| B．is completely against surfing the Net |
| C．knows how to surf the Net efficiently |
| D．thinks the Net brings bads and goods |
The text is most probably taken from.
| A．a health book | B．a geography magazine |
| C．a life magazine | D．a computer technology book |
Taking the train is a wonderful way to see America.In the 19th century,train routes appeared from coast to coast,carrying both people and goods Today,a long-distance Amtrak train trip is a different way to experience the United States.
The long-distance Amtrak trains have lots of room.Coach seats have lots of leg room and wide aisles(走
廊),sightseeing lounges(休闲室) have large windows,and sleeping areas can provide a good night’s rest.On a train trip,there’s time to talk,play cards or board games,and read to one another.On a car trip,parents have to drive while on a train,parents can sit back and watch the scenery go by.Unlike an a
irplane,traveling by train is not the quickest way to arrive at your destination;the train is the destination in itself.
Amtrak manages long-distance trains that run through the United States.Routes have different names,such as Empire Builder,California Zephyr,Sunset Limited and Southwest Chief.The long-distance trains have double-decker cars(Superliners), sightseeing lounges, and a real dining car.On shorter trains,such as from New York to Washington.DC,the cars are single level and only have a snack bar.In the Superliner trains,the sightseeing lounge is lined with windows on the second level while on the lower level a snack bar and tables can be found.In the evening,videos are shown in the lounge car—either entertaining movies or documentaries.
Tip:As delays are common on Amtrak trains,always call the station before you go there.Otherwise,you may be cooling your heels(脚后跟) for hours.What’s the advantage of seeing America by train?
| A．There are more services on the train than any other |
| B．Traveling by train is the quickest way to reach your destination. |
| C．Traveling by train gives people more time to see and do things. |
| D．The trains like Amtrak allow people to enjoy the journey cheaply. |
Which of the following can be found on short-distance Amtrak trains?
| A．Sleeping areas. | B．Snack bars. |
| C．Sightseeing lounges. | D．Coach seats. |
.What does the underlined sentence in the last paragraph mean?
| A．You will have to wait. | B．You make your heel cool. |
| C．You will have no place to stand on the train. | D．Your feet will be hurt on the train. |
.Which of the following about Superliners is true?
| A．There are lines of windows on the lower level. | B．The snack bar is on the higher level. |
| C．A sightseeing lounge is on the upper level. | D．Both levels are equipped with videos. |
As we all know sewing-machine(缝纫机) repair is one of the fastest growing businesses in the world today.Newspapers,women’s magazines,high schools and colleges are all encouraging millions of American women to do their own sewing,not only to make their
own shirts and sweaters,but also to make nice clothes for their husbands,sons,or boyfriends.The lates figures(数字) show that over 89 million American women,because of the high costs of ready-to-wear clothing are now making almost all of their families’ clothes.Most of these women 
get great satisfaction from making the family clothes on their own sewing machines.So it is natural that the demand(要求) for excellent service of sewing machines is growing.
Think of it! 89 million or more sewing machines,not including another 10 million sewing machines in schools of all kinds,need service at least once a year,and quite possibly four or more times each year.I know some women who return their sewing machines to repairmen time after time to get them fixed properly.I’ve seen sewing machines come out of repair shops in worse condition than they were when they went in.
So I’ve decided to write an introduction book to sewing-machine repair and teach people how to repair their own sewing machines at home.It’s not that difficult.In the book,I will teach you everything you need to know about how to repair your sewing machine.The author wrote the passage to.
| A．teach women to repair their sewing machines. |
| B．explain his or her purpose in writing the book |
| C．introduce the reasons for doing one’s own sewing |
| D．tell us that sewing-machine repair is a fast-growing business |
American women make clothes by themselves because.
| A．they cannot buy the clothes they see in magazines |
| B．their husbands or boyfriends want them to do so |
| C．ready-to-wear clothes cost a great deal of money |
| D．they can’t get great satisfaction from buying clothes |
We learn from the passage that sewing machines.
| A．aren’t very difficult to be repaired |
| B．cannot work well after one year |
| C．don’t easily get broken |
| D．need service 4 times a month |
It can be inferred from the passage that.
| A．the book will also show you how to make nice clothes |
| B．there are not enough sewing-machine-repair shops in America |
| C．over 99 million sewing machines need service at least once a year |
| D．the demand for excellent service of sewing machines grows the fastest in America |
Can you imagine exchanging the pleasure of city life for a quiet life in the countryside?
Many people want to move from the country to the city because they think that life in the city is more exciting and better than that in countryside,especially young people
wh
o like new,modern things.People like popular things and feel that they can only find the latest styles in the city.
However,it 
is possible to enjoy the higher quality of country life and still enjoy some o
f the advantages of living in the city.
Nowadays,traveling is fast and easy,and information can be found on the Internet,so many people are able to do their work in home offices.Because they have e-mail and personal computers,they don’t have to be in big cities to manage their businesses.It is not important where they actually work because the results of their work can be sent everywhere with e-mails.Therefore,there is no need to put up with all of the disadvantages of the city.Now they can escape busy city life to enjoy the quiet country life and still be able to have successful jobs.
Other people are interested in technological things and high-tech jobs and think they can only find them in big cities.If they want to find a job,especially a good position in a company,they think that they have to live in a
city.For these jobs,they are willing to put up with many of the disadvantages of city life,such as crime,heavy traffic,and pollution.The main idea of this passage is that.
| A．life in the city is different from life in the countryside |
B．people prefer living in the city to l iving in the countryside |
| C．cities have more disadvantages than the countryside |
| D．more and more people like living in the city |
With the development of,people can enjoy life in the countryside as comfortably as they can in the city.
| A．e-mail technology | B．personal computers |
| C．transportation and computers | D．business |
According to the passage,what does the countryside have but cit
ies don’t have?
| A．Technology. | B．Traffic. | C．Education. | D．Natural environment. |
What is the author’s attitude towards city life?
| A．He is for it. | B．He is against it. |
C．He likes neither. | D．He shows no opinion. |
Alaskan black bears hibernate for up to seven months a year, during which time they do not eat or drink, before waking up in virtually the same physical state they fell asleep in．
Now experts hope to develop methods of putting humans into a similar state which could help astronauts survive long missions and lead to new ways of treating severely ill patients．
While many studies have examined hibernation in mice and hedgehogs, little research has been done into the same condition in larger mammals such as bears．
But new research conducted at the Institute of Arctic Biology at the University of Alaska monitored the animals' body temperature, heart rate and muscle movements while they slept.
The research results showed that during a five-month hibernation the bears’ body temeratures varied between 30℃ and 36℃ in cycles that lasted between two and seven days—a pattern that was previously unknown in hibernating animals.
The research project leader said, "If our research could help by showing how to reduce metabolic(新陈代谢的) rates and oxygen demands in human tissues, one could possibly save severely ill patients. We simply need to know how to turn things on and off to take advantage of the different levels of hibernation."
Craig Heller, of Stanford University, who contributed to the study, added: "There has always been a thought that, if there is ever long-distance space travel, it would be good to be able to put people into a state of lower metabolism or a state of hibernation. That's almost science fiction but you can see the logical basis."We know from the text that .
A．during winter Alaskan black bears sleep for more than half a yea r |
| B．researchers have examined hibernation in humans |
| C．experts have got no results from their research |
| D．Craig Heller is a leader from the Institute of Arctic Biology |
The best topic of the text should be ．
．
| A．The Latest Research Results |
| B．New Methods of Putting Humans into Hibernation |
| C．Alaskan Black Bears Hibernate |
| D．Astronauts Could Hibernate Like Bears |
According to the text, we can infer that.
| A．many studies have examined hibernation in mice and bears as well |
| B．humans' body temperatures vary between 30℃ and 36℃ while they sleep |
| C．research into hibernation in animals may help deadly patients stay longer |
| D．scientists have already take advantage of the different levels of hibernation in space missions |