【C20】

r.【C1】______some people have become【C2】______about another kind of pollution. It can be everywhere, depending on the time of day.【C3】______it is not thought of as a【C4】______. It is light.

The idea of light pollution has【C5】______with the increase of【C6】______in cities. In many areas, this light makes it【C7】______to observe stars and planets in the night sky. In 1922, the International Dark-Sky Association formed. This organization wants to reduce light pollution in the【C8】______sky. It also【C9】______the effective use of electric lighting.

Light pollution is the【C10】______of wasted energy. Bright light that shines into the sky is not being used to provide light【C11】______it is needed on Earth.【C12】______designed【C13】______causes a great deal of light pollution. Lights that are brighter than【C14】______also cause light pollution.

Most people in America are【C15】______to find out that they are not able to see our own galaxy, The Milky Way, with their own eyes.【C16】______about three-fourths of Americans cannot see the Milky Way because of【C17】______light.

Objects in the night sky are【C18】______that provide everyone【C19】______wonder. But light pollution threatens to prevent those wonderful sights【C20】______being seen.

【C1】

A．So

B．But

C．And

D．Hence

】______we rarely think twice when we switch on the light or turn on the TV set. At night, roads are brightly lit, enabling people and【C2】______ to move freely. Neon lighting used in advertising has become part of the【C3】______of every modern city. In the home, many【C4】______devices are powered by electricity.【C5】______when we turn off the bedside lamp and are【C6】______ asleep, electricity is working for us,【C7】______our refrigerators, heating our water, or keeping our rooms air-conditioned. Every day, trains, buses and subways take us to and from work. We rarely【C8】______ to consider why or how they run—【C9】______something goes wrong. In the summer of 1959, something【C10】______go wrong with the power-plant that provided New York with electricity. For a great many hours, life came almost to a【C11】______. Trains refused to move and the people in them sat in the dark,【C12】______to do anything: lifts stopped working, so that【C13】______ you were lucky enough not to be【C14】______between two floors, you had the unpleasant task of finding your way down【C15】______ of stairs. Famous streets like Broadway and Fifth Avenue in a(n)【C16】_____ became as gloomy and uninviting【C17】______ the most remote back streets. People were afraid to leave their houses,【C18】______ although the police had been ordered to【C19】______ in case of emergency, they were just as confused and【C20】______ as anybody else.

【C1】

A．so

B．as

C．thus

D．that

Small business owners most accept the burdens of entrepreneurship(企业家的职责). Being in business for yourself requires your full attention. You seldom leave the office or shop at 5 p.m.【C1】______do you leave job problems there. They follow you home as business homework. This【C2】______less time for your personal life.

The【C3】______you sought can put you on the spot. You don't report to a boss. But you do【C4】______as hard as possible to serve your customers. They are your"【C5】______". You also have to compete with creditors, employees, suppliers, and tax collectors. In other words, you are never really【C6】______.

Small firms can seldom afford to【C7】______enough employees so that each can specialize. You may have to prepare ads,【C8】______records, make sales calls, and collect bad debts. You must be able to "wear many hats".【C9】______all these tasks take up lots of time. But you cannot【C10】______long-range planning. You have to set goals and develop plans to meet them. Give too【C11】______time to management and your business will fail.

The major cause of business【C12】______is poor management. Of every three business that start, two fail.【C13】______half fail in the first five years. A per son with limited talents may be able to hold a job in a large firm【C14】______others will pick up the slack(松懈，懈怠). When you are in business【C15】______yourself, there is no one to "carry you".

Even if your firm【C16】______, you may still have little money to spend. You may work hard for months and not take a penny out,【C17】______the salary you pay yourself. The reason is you may have to【C18】______your profits in the firm for long-term growth. Or you may need to meet short-term【C19】______for cash. You may not even be able to draw a salary【C20】______the firm becomes a truly going concern.

【C1】

A．So

B．Also

C．Nor

D．Either

A.so that

B.such

C.so

D.such that

【C17】

A．So many

B．Not every

C．No

D．Any

______

A．so that

B．so

C．in order to

A．so

B．like

C．such

A.So far

B.By far

C.So few

D.So much

A.so that

B.so as to

C.so

D.so what

【C3】

A．so as to

B．in order

C．so that

D．for