题目内容：

    The twentieth century saw greater changes than any century before: changes for the better, changes for the worse; changes that brought a lot of benefits to human beings, changes that put man in danger. 1.

Scientific research in physics and biology has vastly broadened our views. It has given us a deeper knowledge of the structure of matter and of the universe, 2.. Technology in the application of science has made big advances that have benefited us in nearly every part of life.

The continuation of such activities in the twenty-first century will result in even greater advantages to human beings: in pure science—a wider and deeper knowledge in all fields of learning: in applied science—a more reasonable sharing of material benefits, and better protection of the environment.

3. The creativity of science has been employed in doing damage to mankind. The application of and technology to the development and production of weapons of mass destruction has created a real danger to the continued existence of the human race on this planet. 4. Although their actual use has so far occurred only in the Second World War, the number of nuclear weapons that were produced and made ready for use was so large that if the weapons had actually been used, the result could have been the rain of the human race, as well as of many kinds of animals.

William Shakespeare said, “The web of our life is of a mingled yarn (纱线), good and ill together. “5. But does it have to be so? Must the ill always go together with the good? Are we biologically programmed for war?

A.We have seen this happen in the case of nuclear weapons.

B.Sadly, however, there is another side to the picture.

C.Fortunately, science has brought us with the greatest

D.It offers us less access to nature as well as social life.

E.The above brief review of the application of only one part of human activities—science seems to prove what Shakespeare said.

F.Many things caused the changes, but in my opinion, the most important was the progress in science.

G.It has brought us a better understanding of the nature of life and of its continuous development.