What worries Richard Smith, the Skylab`s director, is the `big pieces` that will come through the atmosphere. Two lumps, weighing 2 tons each, and ten, weighing at least 1,000 pounds each, will come in at speeds of hundreds of miles an hour, and if they crash on land they will dig holes up to 100 feet deep.
What worries us, with our lack of scientific knowledge and our quick imagination, is both the big and little pieces, although project officials say there is a very small chance that anyone will be injured by them.
That’s good to know, but it doesn`t remove the doubts of the millions who still remember the nuclear accident at Three Mile Island. That accident took place in 1979 in spite of what the officials had assured us as to the safety of the nuclear reactor.
21. Where the Skylab will fall ________.
A) is kept secret C) has been predicted by scientists
B) has been made public D) can`t be predicted even by computers
22. According to the passage, what does an incident such as the failed Skylab make us do?
A) Not to believe in officials. C) Think about our future.
B) Trust computers more. D) Fear for our lives.
23. The author suggests that ________.
A) the danger of the Skylab`s fall has been overestimated
B) it’s useless to worry over things you can`t do anything about
C) computers can solve the problem caused by the broken Skylab
D) the danger of the Skylab`s fall has been underestimated
24. The author refers to Three Mile Island ________.
A) because he fears that a piece of the Skylab may strike a nuclear power plant
B) because he is doubtful about what the officials said
C) because he is afraid of the use of nuclear power