Which of the following is true of Mr. Litmus?

 Time travel has long attracted people. Traveling to the past or future would allow you to live in exciting periods of history or to get a brief look at what the world would be like in the future. Since the idea is so tempting, it is natural that time travel would interest so many writers, filmmakers, and scientists. But you might be surprised to realize that in the smallest sense of the term, we are all time travelers. Even as you sit here reading this article, time is racing forward The future becomes the past as soon as it happens.

66.在同一座楼里上班,你难免会遇到她。

67.会议什么时候召开还没有确定。

68.想去长城参观的人,请在这里签名。

69.她悄悄走进来,以免吵醒婴儿。

70.你能帮我照看一下行李吗?

36.节日 n. f_____                    

37.编辑 n. e_____

38.饿死，挨饿 v. s_____              

39.普遍的 a u _____

40.毕业 v. g _____                          

41.阴影，影子 n. s_____

42.警告 v. w_____             

43.忠诚的 a l_____

44.表达;表情 n. e_____                    

45.原理;原则 n. p_____

46.热带的 a t_____                           

47.机会 n. o_____

48.可靠的a r_____                             

49.精确的;准确的a p_____

50.发行，颁布 v. i_____                     

51.目标 n. t_____

52.财政;金融 n. f_____             

53.占领;职业 n. o_____

54.军事的 a m_____              

55.年轻的;有朝气的 a y_____

56.He tried to repair the engine, but without____ (succeed).

57. I said goodbye to them with a mixture of____ (sad) and joy.

58. There was a____ (drama) increase in the world population in the first half of the 20th century.

59. Good teamwork is a____ (power)tool for effective management.

60. There have been great advances in the____ (treat) of cancer.

61. When I was at school, we were required to ____ (memory) a poem every week.

62. The Internet provides many resources that were previously____ (available) to us

63. College was more difficult than he had expected; however, he managed to reach his____ (origin) goals.

64. This photo is too small. Please____ ____ (large) it for me.

65. For your ____ (safe), we advise you to keep your seat belt fastened during the flight.

Up to now, the best way to get spider silk is by .

Spider silk is the preferred material for bulletproof vests because it is .

Passage ThreeQuestions 31 to 35 are based on the following passage.It is said that when the mighty ruler Genghis Khan conquered Asia, his soldiers were protected from enemy arrows by very special clothing. These leather garments were woven with one of the strongest materials then known to humans-spider silk!Eight hundred years later, scientists still can't make thread more durable(耐用的)than the stuff spiders use to make webs. But biologists trying to copy nature's strongest fiber are making great progress. The U.S. Army plans to use one of the great Khan' s tricks: making bulletproof vests woven with artificial spider silk.What makes spider silk so remarkable is its unique combination of strength and stretch. Spider silk is as strong as the fiber now used to make bulletproof vests, but far more elastic(有弹性的). The web of a golden silk spider is strong enough to trap a bird Researchers have figured out that a web woven of spider silk the thickness of a pencil could stop a plane in midair!"When you think about the size and speed of a flying bee, the web that catches it has to be able to absorb a lot of energy, " says Jean Herbert, an Army scientist in Natick, Massachusetts. Herbert is researching ways to use the tough fiber in everyday objects. Among the possibilities: jeans that don't wear out, car and truck bumpers that resist dents, and bridges whose structures can withstand earthquakes.Unlike silkworms, spiders cannot be raised on farms. One reason: they tend to eat one another!) So scientists are inventing ways of making spider silk without spiders.The ability to spin a web is controlled by certain genes inside the cells of spiders. Researchers at two chemical companies have made copies of these genes and put them into certain easy-to-grow bacteria(细菌). The scientists'goal: bacteria that can tun out spider silk. Transplanting spider genes is a sticky business. The genes don't always act exactly the way they would in a living spider so the silk is not as strong or elastic as the real stuff.For now, the surest silk-production method is the one that Genghis Khan supposedly used-spiders themselves. "I never step on spiders, "says chemist John O'Brien. "I have too much respect for them."

31The word"garments"(para 1) is closest in meaning to .

Biologists are making great progress in .

According to the passage, which of the following is true?

The League of American Wheelmen was formed to .