完形填空：（共10小题，每小题2分，满分20分）
In Glasgow, Scotland, a young lady, like a lot of teens today, got tired of home. The daughter objected to her family’s __41__ lifestyle and said, “I don’t want your God. I am leaving!”
She left home. Before long, she was disappointed and unable to find a job, so she tried to do everything she could to __42__ . Many years passed by, her father died, her mother grew __43__, and the daughter became more and more entrenched(固执) in her way of life.
No contact was made between mother and daughter during these years. The mother, having __44__ her daughter’s whereabouts(行踪，去向), went to the poor part of the city in __45__ of her daughter. She stopped at each of the rescue missions with a simple __46__, “Would you allow me to __47__ this picture?” It was a picture of the smiling, gray-haired mother with a handwritten __48__ at the bottom: “I love you still…come home!”
One day the daughter wandered into a rescue mission for a hot meal. She sat __49__ listening to the service, all the while letting her __50__ wander over to the notice board. There she saw the picture and thought “Could that be my mother?”
She couldn’t wait until the service was over. She stood and went to look. It was her mother, and there were those words, “I love you still…come home!” As she stood in front of the picture, she wept. It was too good to be true.
41. A. modern                           B. religious                          C. awful                      D. simple
42. A. earn money            B. help others     C. find job                   D. become famous
43. A. lonelier                     B. slower          C. elder                            D. older
44. A. told about                         B. heard of                         C. written about      D. talked about
45. A. sight                                   B. charge          C. search                D. need
46. A. request                    B. remark                            C. question                D. speech
47. A. print out                            B. look at                            C. send off                D. put up
48. A. record                                B. order                               C. message     D. notice
49. A. sensitively                        B. absent-mindedly C. devotedly    D. carefully
50. A. eyes                                   B. hands                     C. thoughts     D. imaginations

  Plants can’t communicate by moving or making sounds, as most animals do. Instead, plants produce volatile compounds, chemicals that easily change from a liquid to a gas .A flower’s sweet smell, for example, comes from volatile compounds that the plant produces to attract insects such as bugs and bees.

  Plants can also detect volatile compounds produced by other plants. A tree under attack by hungry insects, for instance, may give off volatile compounds that let other trees know about the attack, In response, the other trees may send off chemicals to keep the bugs away- or even chemicals that attract the bugs’ natural enemies.

  Now scientists have created a quick way to understand what plants are saying: a chemical sensor(传感器) called an electronic nose. The “e-nose” can tell compounds that crop plants make when they’re attacked. Scientists say the e-nose could help quickly detest whether plants are being eaten by insects, But today the only way to detect such insects is to visually inspect individual plants. This is a challenging task for managers of greenhouses, enclosed gardens that can house thousands of plants.

  The research team worked with an e-nose that recognizes volatile compounds. Inside the device, 13 sensors chemically react with volatile compounds. Based on these interactions, the e-nose gives off electronic signals that the scientists analyze using computer software.

  To test the nose, the team presented it with healthy leaves from cucumber, pepper and tomato plants, all common greenhouse crops. Then the scientists collected samples of air around damaged leaves from each type of crop. These plants had been damaged by insects, or by scientists who made holes in the leaves with a hole punch (打孔器).

  The e-nose, it turns out, could identify healthy cucumber, pepper and tomato plants based on the volatile compounds they produce. It could also identify tomato leaves that had been damaged. But even more impressive, the device could tell which type of damage by insects or with a hole punch had been done to the tomato leaves.

  With some fine tuning, a device like the e-nose could one day be used in greenhouses to quickly spot harmful bugs, the researchers say. A device like this could also be used to identify fruits that are perfectly ripe and ready to pick and eat, says Natalia Dudareve, a biochemist at Purdue University in West Lafayette, Ind. who studies smells of flowers and plants. Hopefully, scientists believe, the device could bring large benefits to greenhouse managers in the near future.

49. We learn from the text that plants communicate with each other by______.

A. making some sounds       B. waving their leaves

C. producing some chemicals  D. sending out electronic signals

50. What did the scientists do to find out if the e-nose worked?

A. They presented it with all common crops..

B. They fixed 13 sensors inside the device.

C. They collected different damaged leaves.

D. They made tests on damaged and healthy leaves.

51. According to the writer, the most amazing thing about the e nose is that it can ______.

A. pick out ripe fruits

B. spot the insects quickly

C. distinguish different damages to the leaves

D. recognize unhealthy tomato leaves

52. We can infer from the last paragraph that the e-nose_____.

A. is unable to tell the smell of flowers

B. is not yet used in greenhouses

C. is designed by scientists at Purdue

D. is helpful in killing harmful insects

Although there are no state controlled survival courses in Britain or the United States，there are various independent organizations offering similar activities．Students can participate(take part)in outdoor training courses through university clubs and societies．Anyone can register with such groups，which then organize courses，training and trips for all members．

One of the most popular outdoor training programmes in both the US and Britain is Outward Bound(户外训练)．It was founded in 1941 in Wales and attracts hundreds of thousands of adventurous types every year. The courses are intended to broaden minds through experiences that build confidence, self-esteem(自尊)and character．As well as specialist courses such as canoeing，leadership skills and sailing，participants can take part in week long adventure training camps which include a host of sports and survival training education skills．

Michael Williams，an American student，took part in an Outward Bound course last year．He said：“We learned lots of first aid skills，lots of natural history ,lots of environmental facts, and participated in a wildlife preservation programme．Beyond that，my favorite skills learned were sailing and rock climbing.”Courses can last up to 40 days and are open to anyone over the age of 14．Students must be in general good health，but do not need to be experienced in outdoor-sports．There is no selection process；everyone is welcome，although new participants are advised to pick a course matching their physical capacity．Most of the British courses take place in the Brecon Beacons in Wales．Another similar organization is the UK Survival School，which includes courses on learning to 1ive with the environment， sailing and  winter survival．On a basic survival weekend students will learn how to get water and food, how to make fire and cook with it，to find and build a shelter，control survival life support，how to cross rivers．Send off a distress signal，and to use compasses(指南针)by day and night．

According to the leaders，such adventures are “an awakening, an exploration into the unknown.”Outward Bound believes that participants will “use mind and body traveling some of the Earth’s roughest wilderness areas．”   

1.In Britain and the United States，survival courses are popular with    ．

2.The advantage of the training courses is that   .

3.In an Outward Bound course last year，the most exciting experience Michael Williams had was   .