阅读下面短文，从每题所给的四个选项中，选出最佳答案。
Hi, dear boys and girls! Do you know how to be a healthy kid? Here are some rules you should follow.
First, eat different foods, especially fruit and vegetables. You may have a favorite food, but you'd better eat something different, if you eat different foods, you will probably get more nutrients (营养物质) your body needs.
Then, drink water and milk as often as possible. When you're really thirsty, cold water is the No. l choice. Milk is a great drink that can give you more calcium (钙) your body needs to grow strong bones .
Next, listen to your body. How do you feel when you are full? When you are eating, notice how your body feels and when your stomach feels comfortably full. Eating too much will not make you feel comfortable and make you fat.
Afterwards, limit (限制) screen time. Screen time is the time you watch TV, DVDs and videos, or using computers. It is good to take more exercise such as basketball, bike riding and swimming. You can't watch TV for more than two hours a day.
Finally, be active. One thing you'd like to do as a kid is to find out which activity you like best. Find ways to be active every day.
Follow these rules and you can be a healthy kid.
【小题1】You have to eat different kinds of foods especially _________.

As the developing of the economy(经济) and the population growing, a lack (缺乏) of energy（能量） becomes more and more serious. In the modern world, we can’t live without energy. But do you know where energy comes from?

Nearly all energy comes from the sun, either in a roundabout (不直接的) way or straight from it, in the form of heat rays（光线） and light rays. The light from the moon also comes from the sun. The moon can be said to be like a large mirror which throws back the sun’s light to the earth.

Electrical energy comes from the sun in a roundabout way. For example, it can come from the power of water falling down a mountain. The water falls there as rain, and we know that rain is made by the sun’s heat evaporating on the earth’s surface. This water steam rises, condenses (凝结) on cooling, and falls as rain. The light and heat energy from coal also comes from the sun in a roundabout way. Coal was made by the rocks pushing on trees and plants which died millions of years ago. Those trees and plants grew with the help of sunlight, changing the sun’s energy into chemical energy. When we burn coal, some of this energy is set free.

Energy which we use to drive cars comes from petrol, which was also made with the help of the sun in a roundabout way. Plants and animals which ate the plants, died millions of years ago, and the parts of them that were left were pushed under the rocks in the earth. These parts left from dead animals and plants made petroleum (原油), from which petrol and oil are now formed.

In this way, we can say that the sun is the place where nearly all energy comes from, and that without the sun’s heat and light, there could be no life on earth.

根据短文内容选择最佳答案。

(　 ) 46. The light and heat energy from coal comes from _____.

　　　 A. the sun　　　　　　 B. the moon　　　　　　　 C. the earth

(　 ) 47. The underlined word “evaporating” in the passage means “______” in Chinese.

　　　 A. 挥发　　 　　　　　B. 蒸发 　　　　　　　　　C. 冷却

(　 ) 48. According to the passage, Picture ____ is right.

(　 ) 49. Which of the following is TRUE according to the passage?

A.　　 It takes billions of years to form coal or petrol

B.　　 The writer talks about five kinds of energy

C.　　 Nearly all energy comes from the sun, either in a roundabout way or straight from it, in the form of heat rays and light rays.

(　 ) 50. Which is the best title for the passage?

A. THE SUN　　　　　　 B. ENERGY　　　　　 C. A SERIOUS PROBLEM

If you want to deal with the association (交往) between boys and girl right, here are some “do’s and don’ts” for you to follow.

Keep a normal and healthy state of mind (心态). It is very natural for the boys and girls to contact (接触) each other and build up the friendship with students of the other sex.（性别） We should have more friends of the other sex instead of one or two. We should contact the students in public instead of in secret（秘密）.

Contact students of the other sex warmly, generously and sincerely. Don’t be too nervous or too shy in contact with a person of the other sex. In that case it is very difficult for you to make a lot of friends, as no one likes a person who is too shy to say a word. If you are too shy a person, you can contact the students with the same interest and hobby as you. If you keep doing like that, little by little, you will find you are also as free to express yourself as others.

Don’t fall into the ditch (泥潭) of early love. The boys and girls at adolescence (青春期) are rich in feelings and full of imagination. They are easy to regard（看做） the friendship as a sign of love and to fall in love with each other at an early age. In my opinion, boys and girls at middle school are too young and too tender (嫩的) to shoulder（肩负） the heavy duty of love. Early love is a green apple that can’t be eaten. Do keep out of early love.

根据材料内容选择最佳答案并将其标号填入题前括号内。

21. We should contact students of the other sex in the following ways EXCEPT _______ .

A. with a good state of mind 　　　　　　 B. in public 　　　　 C. in secret

22. The underlined word “imagination” means ___.

A. 想象力　　 　 B. 幻觉　　 C. 感觉

23. A person at adolescence is NOT ___..

A. rich in feeling　　 B. full of imagination　　 　 C.old enough to fall in love

24. Which of the following is NOT true?

A. We’d better not make only one or two friends of the other sex.

B. Some students are too nervous or too shy in contact with a person of the other sex.

C. People like a person who always keeps silent.

25. The main idea of the reading is to _______ .

A. tell students to keep away from early love

B. give some advice on how to deal with the association between boys and girls

C. say contact does good not only to boys but also to girls