74. According to the passage, people are most afraid of _____ during flash floods.

A. the constant influx of water

B. the sudden occurrence of flash floods

C. the quick rising water

D. the great damage of flash floods

73. Which of the following statements in NOT the reason for the occurrence of flash floods?

A. Heavy rains　 B. Ice jams　 C. Dam breaks　 D. Ground water rising

72. What is the best title for the passage?

A. Power of floods　　　 B. Damage of floods

C. When floods happen　 D. Facts about floods

71. Many high school and college students are working as volunteers because 　　　.

A. they have a lot of free time

B. they can remember the problems of younger boys and girls

C. they know how to play

D. they like the work

E

During recent years, floods and flash floods have caused billions of dollars in damage. They are among the most common and widespread of all natural disasters. Even more importantly, they're No.1 weather-related killer. A flood can happen anywhere along the Mississippi, in New England, even in the desert.

The following are some fascinating facts about floods and flash floods.

A flood(commonly called river flood)is high flow of water from a river or similar body of water, happening over a period of time too long to be considered a flash flood. Flooding is caused in many ways. Winter or spring rains, together with melting snows, can fill rivers too quickly. Heavy rains from hurricanes or other tropical(热带的)systems can also produce river flooding. The Mississippi River Flood of 1993 was caused by repeated heavy rain from thunderstorms over a period of weeks.

Flash floods are quickly-rising floods which are usually the result of heavy rains over a short period of time, often only several hours or even less. They can also be caused by ice jams(冰塞)on rivers related to a winter or spring melting, or occasionally even a dam break. The constant influx(汇集)of water finally caused a great overflow to begin, powerful enough to sweep vehicles away, roll big stones into roadways, uproot trees, level buildings, and knock bridges down. The speed of the rising of water is the most frightening thing.

Remember: Move to higher ground and stay away from low areas during heavy rain. Stay out of flooded areas. Never allow children especially to play or walk in flowing water. Never drive your car into water of unknown depths.

70. Volunteers believe that _______.

A. in order to make others happy, they have got to be unhappy

B. the happiest people in the world are those who make themselves happy

C .the happiest people in the world are those who are young and healthy

D. bringing happiness to others makes themselves the happiest people in the world

69. What is Big Brothers?

A. It's a name of a club.

B. It's a home for children who have no brothers.

C. It's the name of a film.

D. It's an organization for boys who no longer have fathers.

68. How do volunteers usually help those who are sick or old

A. They mow their lawns, do their shopping and clean up their houses.

B. They cook for them or wash their clothes.

C. They tell them stories and sing and dance for them.

D. They clean and repair their cars.

67. What should we do when we find our kids experiencing depression?

A. Ask for leave to accompany them at home.

B. Ask them to take antidepressant immediately.

C. Go to see the doctor

D. Ask them to have a good rest.

D

Each nation has many good people who help to take care of others. For example, some high school and college students in the United States often spend many hours as volunteers in hospitals, orphanages or rest homes for the aged. They read books to the people in these places or they just visit them and play games with them or listen to their problems.

Other young volunteers go and work in the homes of people who are sick or old. They paint, clean up or repair their houses, do their shopping or mow their lawns. For boys who no longer have fathers there is an organization called Big Brothers. College students and other men take these boys to baseball games or on fishing trip and help them to get to know things that boys usually learn from their fathers.

Each city has a number of clubs where boys and girls can go to play games. Some of these clubs show films or organize short trips to the mountains or other places of interest. Most of these clubs use a lot of high school and college students as volunteers because they are young enough to remember the problems of young boys and girls.

Volunteers believe that some of the happiest people in the world are those who help to bring happiness to others.