1．　 If you __________ (背叛) your friend ,you will lose him.

78.only then did I realize　　　 79. caught, turned out　　 80. what if

76.Instead of giving up,　　 77. what it means　　 how science works

73. surprising→surprised　 74. you 前加do　 　75. speak→say

70. policeman前加a　　 71.minute→minutes　　 72. How→What　

66. have→had　 　 67. 去掉them　　　　 68. late→later　 　 69. √　　　

33. patient　 34. satisfied　 35. obviously

36-40 BDACD　　 41-45 BADAB

46-50 DCABD　　 51-55 CABAD　　 56-60 CBCAB

61-65.DA BBC

30.misunderstood　 31. curious　 32. heavens　

　76­______ ____ _____ ____, Hawking went on with his research.

　 没有放弃，霍金继续他的研究。

77In the book, Hawking explained both ______ ___ _____ to be a scientist and _______ _______ ______.

　在该书里，霍金既阐述了成为一名科学家意味着什么，又阐述了科学是如何运作的。

78______ ______ ____ ___ ______ the importance of study.

　直到那时我才意识到学习的重要性。

79The man ______ in BeiJing ______ ______ a　 thief.

　那个在北京被抓到的人结果是个贼。

80______ _____ we throw away those things ?

　 我们把那些东西扔掉又怎么样呢？

Keys of Unit 1

1-5 DDCBC　 6-10 BCDDA　 11-15 BDABC　 16-20 BCCAB

21-25 ABABC

26.branches　　 27　 predict　 28.inspiration　 29. analysis

I went shopping with my wife. We have a lot of things to　　 66. _________

buy them. We drove to the center of the city and stopped 　　 67. _________

our car in front of the shop. An hour late, we came back　　　　 68. _________

to the car. But it was strange that we couldn’t open　　　　　 69. _________

the door. So we asked policeman for help. He was　　　　　　 70. _________

glad to help us. A few minute later, he got the door open.　　　 　71. _________

Just then a man came up and shouted angrily. “How are　　　 72. _________

you doing with my car?” We were surprising and went to　　 　73. _________

see the number of the car. What you think we did then?　　　　 74. _________

We had to speak sorry to the man again and again.　　　　　　 75. _________