I can still remember the afternoon when we climbed the mountain as if it were yesterday.

It was a sunny day. Eager to spend some time outside, I went up the mountain with my uncle. The mountain was hard (21) ________(climb) and had tough rocks and streams on it. In the end, (22) ________ (exhaust) and hot, I couldn’t go any further. So we went back down the mountain in the end.

On the way back down, my uncle asked me a question, (23) _____ left me speechless for a second: “What’s your dream, young lady?”

“I have no idea,” I answered (24) _____thinking it for a while. Then he smiled and told me about his story. He didn’t perform well at school when he was a student. Although nobody thought he could succeed, he knew clearly (25) ______his dream was-----to be a businessman. “I knew I wasn’t gifted when it came to studying, so I tried to buy snacks from a market and sell them after class,” he told me. After he left school, he started selling different items to find out which one was most attractive to customers. Of course, he often had no money in his pocket, but (26) ______ tough life was, he never gave up.

“There is no doubt that a person who puts in a great deal of effort to reach his or her goal will have good luck at some point. The meaning of life is to chase your dream,” he said gently.

That night I (27) ______ hardly fall asleep. I lay in bed tossing and turning, asking myself, “What’s my motivation?”

I once wanted to be a top student, but the hard work needed meant (28) _____ (put) everything into following my passion. If I find myself lacking willpower, what should I do? Leaving home early the next morning, I climbed the mountain again by (29) _____. It made me think: If we don’t experience the climb, how can we get to see the scenery on the top of the mountain? In the end, I reached the top and (30) ______ (fascinate) by the warm breeze and sunshine. Nothing could be more pleasant than that.

A. quickly    B. analyze         C. programmed     D. adoption     E. boredom    F. unaccompanied  G. dramatic     H. transform    I. distracted       J. peacefully      K. prospect

Imagine an urban neighborhood where most of the cars are self-driving. What would it be like to be a pedestrian?

Actually, pretty good. In fact, pedestrians might end up with the run of the place.

In a new study published in the Journal of Planning Education and Research, Millard-Ball looks at the __31__ of urban areas where a majority of vehicles are “autonomous” or self-driving. It’s a phenomenon that’s not as far off as one might think.

“Autonomous vehicles have the potential to __32__ travel behavior,” Millard-Ball says. He uses game theory to __33__ the interactions between pedestrians and self-driving vehicles, with a focus on yielding at crosswalks.

Because autonomous vehicles are by design risk-averse, Millard-Ball's model suggests that pedestrians will be able to act with impunity, and he thinks autonomous vehicles may facilitate a shift towards pedestrian-oriented urban neighborhoods. However, Millard-Ball also finds that the __34__ of autonomous vehicles may be hampered by their strategic disadvantage that slows them down in urban traffic.

“Pedestrians routinely play the game of chicken,” Millard-Ball writes. Crossing the street, even at a marked crosswalk without a traffic signal, requires a probability calculation: what are the odds of survival?

The benefit of crossing the street __35__, instead of waiting for a gap in traffic, is traded off against the probability of injury or even death. Pedestrians know that drivers are not interested in running them down -- usually. But there is the chance a driver may be __36__, or drunk.

Self-driving cars are __37__ to obey the rules of the road, including waiting for pedestrians to cross. They could provide the most __38__ transformation in urban transportation systems. Parking, street design, and transportation service networks are likely to be revolutionized. In his latest study, Millard-Ball suggests that the potential benefits of self-driving cars -- avoiding __39__ of traffic and traffic accidents -- may be outweighed by the drawbacks of an always play-it-safe vehicle that slows traffic for everybody.

“From the point of view of a passenger in an automated car, it would be like driving down a street filled with __40__ five-year-old children,” Millard-Ball writes.

Alternatively, planners could seize the opportunity to create more pedestrian-oriented streets. Autonomous vehicles could start a new era of pedestrian domination.

A. However, my work has its challenges.

B. Then a second bit of inspiration came my way.

C. Distressed as I was, I resolved to pursue my interest in research.

D. Besides the spiritual reward, there are other less apparent benefits.

E. So I decided to leave the academic path to find a better match.

F. Here, at last, was a way to combine my interest in science with my passion for teaching.

Ten years ago, after 2 years as a postdoc (博士后), I found myself wondering whether I should take a different road. Up to that point, I had stuck to a pretty traditional path investigating cancer genetics, but I was losing interest in the research. At the same time, federal funding had flattened, which added to my dissatisfaction. ___67___ Then came the hard part: identifying a new career that would nurture my passion for science and allow me to make an impact with my work.

As I was considering my options, I found inspiration in my first graduate school research tutor, whose work reminded me that scientists’ efforts away from the bench can be incredibly powerful. But I still didn’t know exactly what I should do. ___68___ A colleague mentioned that a professor at a nearby 2-year college was training students to produce monoclonal antibodies for labs on campus. I was impressed that the professor had taken on this type of ambitious project with relatively inexperienced students. Curious to find out more, I set up a meeting with John and was struck by his sincerity and the way he prioritized student training above grants, publications, and personal ambition. I could also see his passion for teaching, which reminded me of the dream to become a high school biology teacher.

___69___ I found a faculty position and joined John at the same quiet junior college. Now, I effectively hold two positions: classroom instructor and research co-adviser of 15 inexperienced but eager undergraduates. Both roles give me a chance to help students transform themselves, which is enormously rewarding.

___70___ It’s discouraging when others see both my students and me as less worthy because we are not at universities. We sometimes struggle to get access to federal funding, scientific conferences, and other resources and opportunities. My pay is below the standard at 4-year research institutions, even though my teaching workload is greater. But my occasional frustration is relieved by the thought of the students, who I have helped train.

Looking back at these 10 years, I realize how much my work on this campus has helped me grow, both as an academic and a tutor. I’m grateful that I stepped away from a traditional career path and found a way to serve both the student and research communities in my own way, modest though it may be.

72. 解除病人的痛苦是医生的职责。（relieve）

73. 先进的电脑技术正在逐渐改变我们的购物方式。（way）

74. 大多数孩子很少与父母和老师之外的成年人有密切的接触，他们对大人的生活鲜有概念。（idea）

75. 志愿者活动不仅能使青少年学到如何帮助残疾人，还可以提高他们与陌生人合作的意识。（Not only...）

Everybody loves to hate invasive species. The international list of invasive species—defined as those that were introduced by humans to new places, and then __41__ — runs to over 4,000. In Australia and New Zealand hot war is fought against introduced creatures like cane toads (蔗蟾蜍) and rats.

Some things that are uncontroversial (无争议的) are nonetheless foolish. With a few important exceptions, campaigns to __42__ invasive species are merely a waste of money and effort — for reasons that are partly practical and partly philosophical.

Start with the practical arguments. Most invasive species are neither terribly successful nor very__43__. Britons think themselves surrounded by foreign plants. __44__, Britain’s invasive plants are not widespread, not spreading especially quickly, and often less of a(n) __45__ than vigorous native plants. The arrival of new species almost always __46__ biological diversity (多样性) in a region; in many cases, a flood of newcomers drives no native species to extinction. One reason is that invaders tend to colonise __47__ habitats like polluted lakes and post-industrial wasteland, where little else lives. They are nature’s opportunists.

The philosophical reason for starting war on the invaders is also __48__. Elimination campaigns tend to be __49__ by the belief that it is possible to restore balance to nature — to return woods and lakes to the state before human __50__. That is misguided. Nature is an everlasting mess, with species constantly emerging, withdrawing and hybridizing (杂交). Humans have only quickened these processes. Going back to ancient habitats is becoming __51__ in any case, because of man-made climate change. Taking on the invaders is a(n) __52__ gesture, not a means to an achievable end.

A reasonable attitude to invaders need not imply passivity. A few foreign species are truly __53__ and should be fought: the Nile perch – a fish, has helped drive many species of fish to extinction in Lake Victoria. It makes sense to __54__ pathogens (病菌), especially those that destroy whole native tree species, and to stop known agricultural pests from gaining a foothold. Fencing off wildlife reserves to create open-air ecological museums is fine, too. And it is a good idea for European gardeners to destroy Japanese plants, just as they give no apace to native harmful grasses like bindweed and ground elder. You can garden in a garden. You cannot garden __55__. That is universally accepted.

41. A. multiplied         B. shrunk                        C. disappeared                D. harvested

42. A. conserve             B. eliminate               C. investigate                  D. prioritize

43. A. healthy             B. intentional             C. harmful                   D. profitable

44. A. As a result           B. For example          C. By contrast                D. In fact

45. A. attraction            B. dominance            C. annoyance                  D. substitute

46. A. increases             B. destroys               C. reveals                    D. targets

47. A. oppressed           B. disturbed              C. cultivated                   D. preserved

48. A. acceptable        B. needless            C. mistaken              D. convincing

49. A. fuel(l)ed              B. organized              C. interrupted                 D. greeted

50. A. civilization           B. interference              C. interaction                  D. maintenance

51. A. tolerable              B. impossible            C. beneficial                D. critical

52. A. reluctant             B. disorderly             C. invalid                     D. unbalanced

53. A. damaging            B. flexible              C. doubtful                     D. outstanding

54. A. pick up               B. take in               C. keep out                     D. turn down

55. A. agriculture           B. vegetation          C. atmosphere                D. nature