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Passage 2The top of the world is a wonderland. In winter, the temperature often falls to -30°F and the sun never rises. The ocean is surrounded by frozen ground. There are few people or trees, but to polar bears, the Arctic(北极)is home.(78) Polar bears have thick fur, big paws and other features that make them well prepared for life in their tough environment. In fact, they need the Arctic sea ice for survival. But climate change is causing larger and larger areas of summer sea ice to melt(融化). Experts say that if warming patterns continue, the Arctic could be free of summer sea ice by 2050. That may cause two-thirds of the world’s 20,000 polar bears to be gone by then too.Polar bears can’t survive for long on land. Seals are their main source of food. The only place where polar bears can hunt seals is on the ice. (79) Although these bears are strong swimmers, they are no match for lightning swift seals in the water. A polar bear has brilliantly clever strategies to overcome this disadvantage. In winter the bear waits motionless beside a seal’s breathing hole, which is a narrow tunnel through the ice. Often many hours pass before the seal comes up for air and the bear kills it with a powerful blow of its paw. In summer, the polar bears that live on land eat very little and wait for the sea ice to return.With the sea ice forming later in the year and melting earlier, polar bears do not have enough opportunity to hunt and eat. Less sea ice makes it harder for the bears to catch the seals. The bears must swim longer distances between ice packs(大片浮冰), and they can’t always make it. The ice is also getting thinner. These conditions can cause polar-bear cabs to become separated from their mothers, who provide them with food.Steven Amstrup is the chief scientist of Polar Bears International. The group aims to save the bears and their home. "The more people who see polar bears and understand their difficult situation, the better the chance we’ll alter our warming path in time to save them," he says. Which is the best title for the passage()

A. Climate Change in the Arctic
B. How to Protect the Environment
C. The Arctic Ts Home to Polar Bears
D. Polar Bears in Danger

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43()

A. heard from
B. cared for
C. knew of
D. read about

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57()

A. lightly
B. jokingly
C. seriously
D. properly

Passage Three There was a time when, if a lady got into a crowded bus or train, a gentleman would immediately stand up and offer his seat. But now, things are different. Today a gentleman will probably look out of the window or if he feels a bit shy, hide behind his newspaper. Either way, the lady will have to stand until someone else gets off. You can`t entirely blame men for this change in manners, though. Gone are the days when women could be referred to as weakers without causing trouble. A whole generation of women has grown up demanding equality with men, not just equality in jobs or education, but in social life. Hold a door open for some women and you are likely to get an angry lecture on treating women as weakers unable to open doors for themselves. Take a girl out for meal and she`ll probably insist on paying her share of the bill. On second thoughts, that is perhaps not a bad idea. It`s no wonder then, that men have given up some ways of politeness and consideration which they used to show towards women. On the other hand, the man`s active politeness is perhaps slowly being replaced by true consideration for the needs and feelings of women, so that men can see women as equal human beings, rather than as weakers or something that can be used to please men. Maybe it is worth women`s while to stand in the bus or train. What men do towards women on a crowded bus or train today is ().

A. really bad
B. strange enough
C. not entirely wrong
D. entirely wrong

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