We certainly know that our universe exists, but this knowledge alone has not satisfied human’s long search for further understanding. Our curiosity has led us to question our place in this universe and even the place of the universe itself. Throughout (贯穿) time we have asked ourselves these questions: How did our universe begin? How old is our universe? How did matter come to exist? Obviously, these are not simple questions. Throughout our brief history on this planet much time and effort has been spent looking for some clue (线索). Yet, after all this energy has been used up, much of what we know is still only speculation (推测).

However, we have come a long way from the beginnings of the study of cosmology and the origins of the universe. Through the understandings of modern science, we have been able to provide firm theories for some of the answers that we once called speculation. True to the nature of science, most of these answers have only led to more interesting and complex (复杂的) questions. 

 It will be impossible to deal with all of the questions about the creation of everything that we know as reality in this short passage, but an attempt will be made to deal with certain basic questions of our being. It will be important to keep in mind that all of this information is often being questioned and reevaluated (再评估) in order to understand the universe more clearly. For our purposes, through an examination of what is known about the Big Bang itself and the age of the universe, we believe that we can begin to answer several of these key questions.

63. We can infer from the first paragraph that ________.

A. human beings needn’t have tried to know about the universe

B. human beings have no ability to know about the universe at all

C. Curiosity has helped human beings to know the universe well

D. It is difficult for human beings to know the universe very well

64. According to the passage, ________ helps people answer some complex questions.

A. curiosity        B. science        C. speculation        D. history

65. According to the passage, which of the following statements is NOT true?

A. We will find the answers to all the questions about the universe soon.

B. Much work needs to be done to know more about the universe.

C. Some of the speculations about the universe have proved true.

D. The Big Bang is a very important theory to know about the universe.