42、One of the advantages serf-employment offers is that self-employed people__________ .

　　A.may decide when and how long they work

　　B.have outstanding abilities and intelligence

　　C.may get more business support from the government

　　D.are easy to earn money and ready to become wealthy

　　43、One problem of serf-employment is that__________ .

　　A.there is no guarantee of income security

　　B.it is comparatively weak in management

　　C.an employer's earnings have nothing to do with business conditions

　　D.salaries may vary greatly from person to person

　　44、We may guess from the context that fringe benefits__________ .

　　A.are all the money provided for employees

　　B.are benefits an employee receives apart from wages and salaries

　　C.consist of those that are paid by insurance companies

　　D.result from business activities the employer.has organized

　　45、The author's attitude towards self-employment is__________ .

　　A.positive

　　B.negative

　　C.indifferent

　　D.objective

　　46、根據(jù)以下內(nèi)容回答46-65題：

　　The first astronaut to walk in space，Leonov，and his companion，Belaiev，began making preparations for the walk as soon as their spaceship was launched.The spaceship was equipped with a double door，which was fitted with a bellows(風(fēng)箱)between the ship and the outside.

　　This made it possible for the astronaut，in his space suit with oxygen supply，to go first from the air-filled ship to the bellows.Then the air was let out of the bellows，and while the man stepped outside，the air inside the ship remained at normal pressure.If the door had opened di-rectlV into space，the air in the ship would have rushed out and been lost when.the dooropened.

　　Leonov and Balaiev practiced testing the doors several times after they had begun moving around the earth.When the time came for Leonov to go out，his companion helped him attach the cable that was to keep him from floating away from the ship.Then Leonov entered the bel-lows，and the door closed behind him.When’there was no air left in the bellows，the outer door opened and Leonov could see the blackness of space and the blinding light of the sun.

　　If the sky appears blue to us on earth，it is because the earth’s atmosphere absorbs a cer-rain number of blue rays of sunlight.Out where there is no air，this phenomenon does not take place.On the earth，our atmosphere spreads light so that，when the sun is up，light seems to be everywhere.However，in the airless outer space，strong lights，such as the sun，exist side by side with a dark similar to the blackest night.The absence of air also explains why the stars do not seem to twinkle(閃爍)in space，as they do from the earth.

　　The spaceship was furnished with a bellows in order to__________ .

　　A.keep air in the ship when its door was opened

　　B.prevent the spaceship from floating in space

　　C.make it possible for the astronauts to walk in space

　　D.provide the astronauts with air under normal pressure