Grown-ups are often surprised by how well they remember something they learned as children but have never practiced still swim as well as ever ever since. A man when he gets back who has not had a chance to go swimming for years can in the water. He can get on a bicycle after many years and still ride away. He can play catch and hit a ball as well as his son. A mother who has not thought about the words for years can teach her daughter the poem that begins "Twinkle, twinkle, little star"。remember the story of Cinderella or Goldilocks and the Three Bears.
One explanation is the law of over learning , which can be stated as follows: Once we have learned something, additional learning trials(尝试)increase the length of time we will remember it.
In childhood we usually continue to practice such skills as swimming, bicycle riding, and playing baseball long after we have learned them. We continue to listen to and remind ourselves of words such as "Twinkle, twinkle, little star" and childhood tales such as Cinderella and Goldilocks. We not only learn but overleam.
The multinlicatinn tables(乘法口诀表)are an excention to the general rule that we forget rather quickly the things that we learn in school, because they are another of the things we overlearn in childhood.
The law of overleaming explains why cramming(突击学习)for an examination. though it may result in a passing grade, is not a satisfactory way to learn a college course. By cramming, a student may learn the subject  well enough to get by on the examination, but he is likely soon to forget almost everything he learned.A little overlearning. on the other hand, is really necessary for one's future development.
小题1:What is the main idea of paragraph I?

A．People remember well what they learned in childhood.

B．Children have a better memory than grown-ups.

C．Poem reading is a good way to learn words.

D．Stories for children arc easy to remember.

小题2:The author explains the law of overleaming by_________.

A．presenting research findings

B．selling down general rules

C．making a comparison

D．using examples

小题3:According to the author, being able to use multiplication tables is_______.

A．a result of overlearning

B．a special case of cramming

C．a skill to deal with math problems

D．a basic step towards advanced studies

小题4:What is the author's opinion on cramming?

A．It leads to failure in college exams.

B．It's helpful only in a limited way.

C．It's possible to result in poor memory.

D．It increases students' learning interest.

Most of the things around you will be replaced or thrown away someday. Where will they go when they are thrown out? What kinds of waste will they create, and how will it affect the environment
Most of our crash goes to places called landfills. A LANDFILL is a low area of land that is filled with garbage（垃圾）.Most modern landfills are lined with a cover of plastic to keep dangerous liquids（液体）from polluting earth and ground water supply. The problem is that more than half of the states in this country are running out of places to landfill their garbage. Because of the unhealthy materials, landfills do not make good neighbors，and people don’t want to live near them. Many landfills are set in poor neighborhoods.
The Fresh Kills landfill on Staten Island, New York, was the largest garbage landfill in the world. For years, people who live nearby complained about air and water pollution caused by the enormous pile of trash. They say that the smoke have made people sick. The landfill closed in
April 2001.Now can a harmful waste—material that can pollute air, land, and water –be disposed of in a safe way.
Another way to get rid of trash is to burn it. Trash is burned in an incinerator._ Because incinerators in operation can get rid of almost all of the trash, some communities would rather use incinerators than landfills. There is a problem, though. Leftover ash and smoke from burning trash may have dangerous chemicals, and even make it hard for some people to breathe. They can harm plants, animals, and people.
You can help reduce（减少）waste by reusing bottles, batteries, and paper. You can also recycle newspaper, glass, and plastics t to provide materials for making other products.
From recycled materials, many things are made. For example, from recycled paper we can get newspapers, boxes and so on. From recycled plastic we can get soda bottles, tables, and backpacks.
小题1:Why don’t landfills make good neighbors?

A．Because there are unhealthy materials in them.

B．Because people prefer to live in the city center.

C．Because landfills are not big enough for trash.

D．Because most states are running out of places.

小题2:What does the underlined word “incinerator”_probably mean?

A．An area to collect trash.	B．A machine to burn trash
C．A method that is used to burn trash.	D．A station that is run by selling trash.

小题3:What is probably the best title for the passage?

A．How Is Trash Burned?	B．What Can Be Reused.
C．Why Is Waste Dangerous?	D．Where Does Garbage Go?