请阅读下列寓言小故事和故事寓意，从所给的六个选项（ A、B、C、D、E和F）中，选出附和各小题要求的最佳选项
下面是几则寓言小故事：
46. An ant went to the bank of a river to quench its thirst, and being carried away by the rush of the stream, was on the point of drowning.  A dove sitting on a tree overhanging the water plucked a leaf and let it fall into the stream close to her.  The ant climbed onto it and floated in safety to the bank.  Shortly afterwards a birdcatcher came and stood under the tree, aiming at the dove.  The ant, perceiving his design, stung him in the foot.  In pain the birdcatcher shouted, and noise made the dove take wing.
47. Two men were travelling together, when a bear suddenly met them on their path.  One of them climbed up quickly into a tree and hid himself in the branches.  The other, seeing that he must be attacked, fell flat on the ground, and when the bear came up and felt him with his snout, and smelt him all over, he held his breath, and pretended to be dead as much as he could.  The bear soon left him, for he will not touch a dead body.  When he disappeared, the other traveler descended from the tree, and asked his friend what it was the bear had whispered in his ear.  “He gave me this advice,” his companion replied.  “Never travel with a friend who deserts you at the approach of danger.”
48. A prince had some monkeys trained to dance.  Being naturally good at learning, they showed themselves excellent pupils, and in their rich clothes and masks, they danced as well as any of the courtiers.  Their performance was often repeated with great applause, till on one occasion a courtier, bent on mischief, took from his pocket a handful of nuts and threw them upon the stage.  The monkeys at the sight of the nuts forgot their dancing and became (as indeed they were) monkeys instead of actors.  Pulling off their masks and tearing their robes, they fought with one another for the nuts.  The dancing spectacle thus came to an end in the laughter and ridicule of the audience.
49. A cock was once strutting up and down the farmyard among the hens when suddenly he noticed something shining in the straw.  “Ho! Ho!” said he, “that’s for me,” and soon rooted it out from beneath the straw.  It turned out to be a pearl that by some chance had been lost in the yard.  “You may be a treasure,” signed the cock, “to man, but for me I would rather have a single barley-corn.”
50. An old man on the point of death summoned his sons around hi to give them some parting advice.  He ordered his servants to bring in a bunch of sticks, and said to his eldest son: “Break it.”  The son tried hard, but with all his efforts was unable to break the bundle.  The other sons also tried, but none of them was successful.  “Untie it,” said the father, “and each of you take a stick.”  When they had done so, he called out to them: “Now, break,” and each stick was easily broken.
请阅读下面的故事寓意，然后匹配与之对应的小故事。
A. Not everything you see is what it appears to be.
B. One man’s pleasure may be another’s pain. / One man’s meat is another’s poison.
C. Misfortune tests the sincerity of friends.
D. One good turn deserves another.
E. Union gives strength.
F. Precious things are for those that can prize them.

We are going to see the ruins of Machu Picchu in the mountains of the Andes．Machu Picchu was forgotten for centuries but discovered in 1911 by Hiram Bingham, a professor from Yale．It is said to be one of the most beautiful ancient sites in the world．

The Incas built the ancient civilization of Machu Picchu between the 12th century and the early 16th century．They spoke a language called Quechua but had no writing system at all．They kept records on various coloured strings with knots called quipu．

The Incas proved to be wonderful architects．They built most of their buildings with huge stones but without using any cement（粘结材料） to stick them together．However, the huge stones fit together so perfectly that you cannot force a sharp knife between two blocks．They also built bridges, tunnels through mountains and channels to bring water to their cities—just as the Romans did．The Incas turned the mountains into farmlands and planted corn and potatoes, and raised animals like llama and alpaca for food．

Now Machu Piccu has become a major tourist site in Peru, attracting people from all over the world．

1.How long ago was Machu Picchu discovered?

A．About 20 years ago            B．About 50 years ago．

C．About 70 years ago            D．About a century ago．

2.With what did the Incas build their wonderful buildings?

              A．strings    B．stones         C．cements              D．trees

3.The Incas built the following like the Romans except _______ according to the passage．

A．roads    B．bridges       C．tunnels     D．channels

4.What does the speaker probably do?

A．A visitor．    B．A guide．   C．A teacher．    D．A scientist．

Deep in the Amazon forest, thousands of people still live in isolation from the rest of the world.
In a recent press release, the Brazilian government confirmed the existence of another isolated tribe of about 200 people living in the Vale do Javari reservation. The 200 people living in the Vale do Javari reservation. The reservation, located near the Peruvian border, is about the size of Portugal. At least another 14 isolated tribes, with a total population of about 2000, call the area home.
The newly observed group lives on four large straw-roofed buildings and grows corn, peanut and other crops.
Brazil’s National Indian Foundation (BNTF) first noticed the reservation in the forest using satellite maps, but it wasn’t until April that an airplane expedition was able to confirm the tribe’s existence. “The work of finding and protecting isolated groups is part of Brazilian public policy,” said the BNIF officer for Vale do Javari, Fabricio Amorim. “To confirm something like this takes years of hard work.”
BNIF estimates there are 68 isolated tribes living in the Amazon. The organization uses airplanes to avoid disturbing the tribes through personal contact, but that doesn’t mean others are so respectful of their right to privacy.
Illegal fishing, woodcutting and hunting bring people into the protected area. Oil exploration on the Peruvian side of the border is another threat. All kinds of criminals also invade the lands of the local groups, said Amorim. The outsiders can damage the land and influence the cultures of indigenous(土著的)peoples. They can also bring diseases which can wipe out the whole population that still lack even basic antibiotics(抗生素).
Brazil’s indigenous peoples won the legal right to their traditional lands in Brazil’s 1988 Constitution, which stated that all indigenous lands shall be divided and turned over to tribes within five years. Indigenous groups now control 11 percent of Brazil’s territory, including 22 percent of the Amazon.
Allowing indigenous groups the right homelands is not just a matter of human rights. The rest of the world can benefit from their knowledge. Mark Plotkin has spent years living with the people of the Amazon and learning from their traditional healers. In his lecture, he pointed out that many useful materials and knowledge, including numerous drugs, can be gained from listening to the indigenous groups of the Amazon. Besides this, they are also more effective at protecting the land, and less expensive, than hired rangers(护林人).
【小题1】The underlined word in the first paragraph probably means “a state of            ”.

完形填空（共20小题；每小题1.5分，满分30分）
Two days before Thanksgiving, I was trying to open my mouth wide enough for a mirror and a roll of steel wire. Metal braces (牙齿矫正器)had been on my   31  for weeks, but this was the day for the wire to be adjusted. Only those who have had braces will understand the terrible   32  of being “wired”. For the next 24 hours, it felt like every tooth was being   33  slowly by a giant clawhammer (拔钉锤).  34  drinking water caused pain.
By Thanksgiving Day, I had got used to it.   35  I didn’t use my teeth, the pain was bearable. But this was a day when teeth had to   36  longer than usual. We were   37  at my grandparents’ house with relatives. The house was filled with so many pleasant   38  that we could hardly resist the food. When grandma said, “Dinner is ready!” all the kids   39  to be first in line. I was so excited that I    40  the braces in my mouth and   41  my way up to the head of the line.
I piled my plate high with my favorite corn-on-the-cob(玉米棒子)and   42  my mouth to enjoy it. The pain was   43 . I felt I would never be able to eat again. I put my plate away and ran outside in   44 .
Grandma then took my plate to the   45 . She cut all the corn off that cob and rescued me from my   46 . She handed me my plate piled high with corn. “Thanks,” I said   47 . Then I looked up and   48  a strange light in her eye, a light that is still   49  to me after more than fifty years. That was the Thanksgiving when I discovered something more   50  than good food.

All too often , a choice that seems sustainable（可持续的）turns out on closer examination to be problematic. Probably the best example is the rush to produce ethanol（乙醇）for fuel from corn . Corn is a renewable resource —you can harvest it and grow more, almost limitlessly. So replacing gas with corn ethanol seems like a great idea.

One might get a bit more energy out of the ethanol than that used to make it, which could still make ethanol more sustainable than gas generally, but that’s not the end of the problem. Using corn to make ethanol means less corn is left to feed animals and people, which drives up the cost of food. That result leads to turning the fallow land — including, in some cases, rain forest in places such as Brazil — into farmland, which in turn gives off lots of carbon dioxide（CO2）into the air. Finally, over many years, the energy benefit from burning ethanol would make up for the forest loss. But by then, climate change would have progressed so far that it might not help.

You cannot really declare any practice “sustainable” until you have done a complete lift-cycle analysis of its environmental（环境的）costs. Even then, technology and public policy keep developing, and that development can lead to unforeseen and undesired results. The admirable goal of living sustainable requires plenty of thought on an ongoing basis.

What might directly cause the loss of the forest according to the text?

A. The growing demand for energy to make ethanol.

B. The increasing carbon dioxide in the air.

C. The greater need for farmland.

D. The big change in weather.

The underline word “it” in the second paragraph refers to

A. the energy benefit               B. the forest loss

C. climate change                  D. burning ethanol

The author thinks that replacing gas with corn ethanol is    

A. impractical   B. acceptable    C. admirable    D. useless

What does the author mainly discuss in the text?

A. Technology.                   B. Sustainability.

C. Ethanol energy.               D. Environmental protection.