59．All of the following statements are TRUE except 　　　　.

　　　 A．few people know how to make good speeches

　　　 B．a lecturer does not need to organize his speech

　　　 C．research is important in preparing a speech

　　　 D．there are simple steps you can take to improve your speaking ability

58．The phrase “talk over their heads” means 　　　　.

　　　 A．speak too loudly　　　　　　　　　　　　　　　　　 B．look at the ceiling

　　　 C．look down upon them　　　　　　　　　　　　　 D．use words and ideas that are too difficult

57．Paragraph 2 implies that 　　　　.

　　　 A．many people are afraid of giving a speech

　　　 B．many people are happy to give a speech

　　　 C．many people don’t prepare for a speech

　　　 D．many people talk too long

56．The main idea of this article is　　　 .

　　　 A．that you can improve your speaking ability

　　　 B．that a poor speaker can never change

　　　 C．to always make a short speech

　　　 D．that it is hard to make a speech

74.　 What is the writer’s attitude towards science?

A. He is sorry because of the ignorance of scientists

B.　 He is delighted because of the latest scientific findings

C. He is doubtful because of the great difficulties in scientific research.

D. He is confident though he knows well the great difficulties in scientific research.

73. Which of he following is NOT mentioned about scientists in earlier times?

　 A. They falsely declared to know all about nature.

　 B. They did not believe in results from scientific observation.

　 C. They paid little attention to the problems they didn’t understand.

　 D. They invented false rules to explain things they didn’t understand.

72.　 It can be inferred from the passage that scientists of the 18^th century _________.

A. thought that they knew a great deal and could deal with most problems of science

B.　　 knew that they were ignorant and wanted to know more about nature

C.　 were　 afraid of facing up to the realities of　 scientific research.

D.　 did more harm than good in man’s understanding nature

71. According to the writer, really good science_____________.

A. would surprise the brightest minds of the 18^th　 century.

B. will help people to make the right choice in advance.

C. will produced results which can be predicted

D.　 will bring about disturbing results

70.　 What is the best title for the passage?

　　　 A.　 Adventure Travel in America

　　　 B.　 Hunting around the Great Mountains

C Interesting Trips in the East of the USA

D. Discovery Trips in the Blue Mountains

E

It is hard to predict how science is going to turn out , and if it is really good science, it is impossible to predict. If the things to be found are actually new, they must be unknown in advance You cannot make choices on this matter. You either have science or you don't and if you have it you have to accept the surprising and disturbing pieces of information, along with the neat and useful bits.

The only solid piece of scientific truth about which I feel totally confident is that we don’t know enough about nature. Indeed, I regard this as the major discovery of the past hundred years of biology. It is, in its way, a clear piece of news. It would have amazed the brightest minds of the 18th century to be told by any of us how little we know and how strange seems the way ahead . In earlier times, they either pretended to understand how things worked or simply made up stones to give answers. Now that we have begun exploring seriously, we are catching sight of how huge the questions are, and how far from being answered. Because of this, we are sorry. It is not so bad being ignorant　　 if you are totally ignorant; the hard thing is knowing in some detail the reality of ignorance, the worst spots and here and there the not-so-bad spots, but no true light at the end of the tunnel nor even any tunnels that can yet be trusted.

But we are making a beginning, and there ought to he some satisfaction. There are probably no questions we can think up that can’t he answered, sooner or later. Within our limits, we should be able to work our way through to all our answers, if we keep at it long enough, arid pay attention.