Scientists have learned a lot about the kinds of food people need. They say that there are several kinds of food that people should eat every day. They are: green and yellow vegetables of all kinds; citrus （柑橘）fruits and tomatoes; potatoes and other fruits and vegetables ; meat of all kinds, fish and eggs; milk and foods made from milk; bread or cereal (谷物), rice is also in this kind of foods; butter or something like butter. 

There are two problems, then, in feeding the large number of people on earth. The first thing is to find some ways to feed the world’s population so that no one is hungry. The second is to make sure that people everywhere have the right kind of food to make them grow to be strong and healthy.

31. According to the scientists, which of the following groups of food is the healthiest for your lunch?

A. chicken, apples, cereal , cabbages.

B. potatoes, carrots, rice, bread.

C. oranges, bananas, fish, tomatoes

D. beef, pork, fish , milk

32. It is important for people to eat __________.

A. three times a day

B. dinner at twelve o’clock

C. cooked food all the day

D. something from each of the seven kinds of food every day.

33. People in different countries and different places of the world________________.

A. have the right kinds of food to eat

B. cook their food in the same way

C. have their meals at the same time

D. eat food in different ways.

34. Which of the following is NOT true?

A. People in some places don’t have enough to eat.

B. There are too many people in the world.

C. One of the problems is that no one is hungry.

D. The scientists are trying to make people grow to be strong and healthy.

35. If there is paragraph 4, wh at do you think is going to be talked about?

A. When people eat their lunch.

B. What to do with the two problems.

C. How to cook food in different ways.

D. Why people eat different kinds of food. 

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Batteries can power anything from small sensors to large systems. While scientists are finding ways to make them smaller but even more powerful, problems can arise when these batteries are much larger and heavier than the devices themselves. University of Missouri(MU) researchers are developing a nuclear energy source that is smaller, lighter and more efficient.

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“People hear the word ‘nuclear’ and think of something very dangerous,” he said, “However, nuclear power sources have already been safely powering a variety of devices, such as pace-makers, space satellites and underwater systems.”

His new idea is not only in the battery’s size, but also in its semiconductor(半導(dǎo)體). Kwon’s battery uses a liquid semiconductor rather than a solid semiconductor.

“The key part of using a radioactive battery is that when you harvest the energy, part of the radiation energy can damage the lattice structure(晶體結(jié)構(gòu)) of the solid semiconductor,” Kwon said, “By using a liquid semiconductor, we believe we can minimize that problem.”

Together with J. David Robertson, chemistry professor and associate director of the MU Research Reactor, Kwon is working to build and test the battery. In the future, they hope to increase the battery’s power, shrink its size and try with various other materials. Kwon said that battery could be thinner than the thickness of human hair.

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C. newspaper ad    D. science fiction story

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    People diet to look more attractive. Fish diet to avoid being beaten up, thrown out of their social group, and getting eaten as a result. That is the fascinating conclusion of the latest research into fish behavior by a team of Australian scientists.

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A. Fish dieting and human dieting.

B. Dieting and health.

C. Human dieting.

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