45. What is the passage mainly about?

36. In the writers opinion, many great men _____. 

60. 被邀请人的数目是50人，但是有很多人因为各种原因缺席了。

61.鉴于以上所述，我认为大学生有必要参加社会实践。

64.我们已研制出了能大规模提高生产的方法。

（ ）14. Farsightedness enables people to see things far away clearly.

23. Not until the game had begun _____ at the sports ground. 

56.众所周知，肺癌至少部分是由于吸烟过多而引起的。

29. Some students have difficulty _____ English, so they often ask their English teacher for help. 

48. (2) Bad stress: Stress can last long if you are___ to deal with your problems. It can actually let you do worse in your daily life.

32. Never _____ such a splendid building, I’m shocked. 

46. Meaning of stress: Stress is a feeling if you______ about something that you cannot solve.