1、英語課堂練習(xí)（ ） 1. Im old enough to wash _ clothes by myself. You can just wash _. A. my; yourB. mine; yourC. my; yours(正確答案)D. your; my（ ） 2. “Has _ ever seen electricity?” Ben asked his dad. A. somebodyB. anybody(正確答案)C. nobodyD. no one（ ）3. Electricity is like water, in _ way. A. a(正確答案)B. anC. theD. /

2、（ ）4. Electricity comes into our flat _ thin wires. A. crossB. overC. acrossD. through(正確答案)（ ） 5. Benny would like to know _ about packets that contain electricity. A. a fewB. a lot ofC. a little(正確答案)D. many（ ） 6. It seems that people use electricity everywhere, in one way or _. A. otherB. another

3、(正確答案)C. othersD. the other（ ） 7. A(n) _ usually means someone who does housework for money. A. electricianB. shop assistantC. servant(正確答案)D. master（ ） 8. Oxygen is necessary for men to keep themselves _. A. warmB. quietC. alive(正確答案)D. clean（ ） 9. Parents must stop their children from _ dangerous

4、things. A. doB. to doC. doesD. doing(正確答案)（ ） 10. Jane is glad to find that her daughter _ sing so well. A. mustB. can(正確答案)C. mayD. need（ ） 11. Its necessary for us to _ the extra lights we dont need. A. switch off(正確答案)B. switch onC. closeD. open（ ） 12. Thick wires are connected to a power station

5、. The underlined word means “_”. A. went intoB. as well asC. joined together(正確答案)D. came from（ ）13. Dont leave the tap running _ you are brushing your teeth. A. while(正確答案)B. beforeC. afterD. until（ ） 14. The weather report doesnt say _. A. if it rains tomorrowB. if it would rain tomorrowC. if it w

6、ill rain tomorrow(正確答案)D. when will it rain tomorrow（ ） 15. The woman _ any washing when the lights _ out. A. wasnt doing, was goingB. wasnt doing, went(正確答案)C. didnt do, was goingD. didnt do, went（ ） 16. In earliest times, men considered lightning to be one of the great mysteries of nature. Some an

7、cient people believed that lightning and thunder were the weapons of the gods.In fact, lightning is a flow of electricity formed high above the Earth. A single flash of 1.6-kilometre-long lightning has enough electricity to light one million light bulbs.The American scientist and statesman, Benjamin

8、 Franklin, was the first to show the connection between electricity and lightning in 1752. In the same year he also built the first lightning rod (避雷針). The device protects buildings from being damaged by lightning.Modern science has discovered that one stroke of lightning has a voltage (電壓) of more

9、 than 15 million volts(伏特). A flash of lightning between a cloud and the Earth may be as long as 13 kilometres, and travel at a speed of 30 million metres per second.Scientists judge that there are about 2,000 million flashes of lightning per year. Lightning hits the Empire State Building in New Yor

10、k City 30 to 48 times a year. In the United States alone it kills an average of one person every day.The safest place to be in case of an electrical storm is in a closed car. Outside, one should go to low ground and not stay under trees. Also, one should stay out of water and away from metal fences.

11、 Inside a house, people should avoid open doorways and windows and not touch wires or metal things.With lightning, it is better to be safe than sorry. A. the skyB. the gods(正確答案)C. the EarthD. nature（ ） 17. According to the passage, what do you think of all buildings need? A. Metal fences.B. Electri

12、city.C. Lightning rods.(正確答案)D. Machines.（ ） 18. Lightning can travel _. A. as quickly as waterB. not so quickly as electricityC. at a very low speedD. at a very high speed(正確答案)（ ） 19. Which of the following is NOT true? A. In the , about one person per day dies from lightning.B. The Empire State B

13、uilding frequently gets hit by lightning.C. Swimming during a thunder storm is a good idea.(正確答案)D. A closed car is the best place to be during an electrical storm.（ ） 20. Lightning is probably _ to man. A. useful(正確答案)B. kindC. uselessD. friendly（ ） 21. From the passage, we know that it is not safe

14、 to _ in the electrical storm. A. go to low groundB. stay under trees(正確答案)C. stay out of water and away from metal fencesD. avoid open doorways and windows（ ） 22. More than three hundred primary students and soldiers took part in an environment education program. They picked up rubbish around the L

15、halu Wetland Conservation area in on June 5th to _59_ the World Environment Day.A team of ten scientists and experts from all over the country took part in the one-day_60_ to share their knowledge of environment protection with students and soldiers.“We take this special day to teach others how to d

16、o good for environment protection, and we hope the awareness of environment protection can be _61_ through this activity,” said Zhang Lin, a member of the team.“It is my sixth time to attend the activity and it is so _62_ for us students to take part in such an activity. Our knowledge of environment

17、 protection has been strengthened,” said Feng Yingying, a primary school student at Lhasas Lhalu Primary School. “I think rubbish is _63_ for our environment. We collect waste, and then we will recycle the rubbish,” she said.The students spent the rest of the day on the main streets of Lhasa to _64_ leaflets (傳單) and slogans about environment protection.A. getB. costC. takeD. celebrate(