CATV began in 1948. People in places far from TV stations shared the 51 （）of putting up high antennas. A community antenna was usually placed on a hill, a mountain, or on a high tower. The antenna picked up TV signals and fed them into a small local station. From the station, thick wires called cables ran out to nearby homes. Each person using the cable paid a monthly 52（）

CATV worked well, and soon new uses were found 53 it. Local stations could feed programs into 54（） channels that were not in use. People along the cable could have local news, weather reports, and farm and school news at no 55（） charge. 

Today, cable television has moved into cities. It brings in extra programs that city viewers with regular antennas cannot see. It is also used in many classrooms throughout the country. 

A. follow    B. into           C. move      D. regular    E. from     F. special         G. empty  H. for 

I. reach       J. watchers    K. money    L. charge     M. cost     N. viewers      O. extra

A.outcomes         B. broad          C. ask            D. culture          E. watch        F. exciting        G. large       H. opportunity I. certainly           J. past           K. examination         L. boring         M. answer      N. emotions      O. perhaps

So what principles should you 51（） when you go out shopping? If you keep your home your car or any valuable 52（） in excellent condition, you’ll be saving money in the long run．Before you buy a new 53（） , talk to someone who owns one．If you can, use it or borrow it to check whether it suits your particular purpose. Before you buy a(n) 54（） appliance, or a service, do check the price and what is on offer．If possible, choose 55（）three items or three estimates． 

A. possession         B. save      C. best         D. expensive      E. material        F. from      G. simple         H. with                 I. in           J. waster        K. model         L. item            M. easy           N. adopt             O. reasonable

Plastic was first 47（）in the 1860s. While quickly gained acceptance in the manufacture of many items , companies did 

not using plastic to produce shopping bags until the 1970s. These first bags were 48（）from polyethylene （ 聚 乙 烯 ）, a type of plastic made from oil and natural gas. In the United States America, plastic shopping bags became 49（）used in 1982, when Kroger and Safeway grocery stores to 50（） their customers plastic bags instead of paper ones. 

Since 1982, plastic bags have been the most common bags of choice among consumers. However, in recent years, many people have increasingly 51（）to the use of plastic bags. The use of oil and natural gas to manufacture the bags reduces the 52（） supplies of these raw materials. Polyethylene plastic bags also are usually only used once and then 53（）of in the trash. These bags take 54（） to begin to decompose (分解)and 55（） harmful chemicals in the process. Plastic bags can also be harmful to children and wildlife.

A.broadly   B. widely    C. generation(s)    D. remain    E. sell     F. objected     G. release    H. introduced 

I. against    J. available     K. reveal      L. disposed      M. manufactured      N. imported       O. offer

The report, from the Institute of Medicine, says most healthy people 47（） their daily needs for liquid by letting thirst be their guide. The report contains some 48（） suggestions. The experts say women should get about 2. 7 liters of water 49（）Men should get about 3.7 liters. But wait----in each case, that is more than eight glasses. There is an important differences. The report does not tell people how 50（）glasses of water to drink. In fact, the experts say it 51（） be impossible to know how many glasses are needed to meet these guideline. This is 52（） the daily water requirement can include the water content in foods. 

People do not get water only by forcing themselves to drink a set number of glasses per day. People also drink fruit juices and sodas and milk. They drink coffee and tea. 53（） all contain water. Yet also contain caffeine. This causes the body to expel (排出）morewater. 54 （）the writers of the report say this does not mean the body loses too much water. 

As you might expect, the Institute of Medicine says people need to drink more water when they are 55（） active. The same is true of those who live in hot climates. Depending on heat and activity, people could need twice as much water as others do. 

A. And        B. because         C. But           D. daily         E. different         F. general            G. many          H. may 

I. meet        J. mentally          K. much        L. physically          M. same            N. These             O. why

His female counterparts have welcomed Martin, although some men think his 52（） career makes him a bit “soft“.“I feel sorry for them,”he sighs, “just because I work with women and kids, it doesn’t 53（） I’m feminine or strange.” But he admits that it will be some time 54（） male nannies are totally accepted. “I’ll happen 55 （）, but there’s no reason why men can't do this job as well as women.”

A．easier       B. gradually         C. before        D. chosen          E. show         F. after      G. equipped        H. rewarding

 I. useful            J. mean         K. happiness           L. gift           M. quickly           N. money           O. image