30. What is the author’s main purpose in the passage?

　　【解析】選[C]。本文除了歷數(shù)賽珍珠(Pearl Buck)的文學(xué)成就外，主要介紹了她的寫(xiě)作背景(a product of two cultures)以及她廣泛的興趣關(guān)注(a wife and mother, an internationally famous writer and a humanitarian and a charitable person)。選項(xiàng)[C]是對(duì)此的最佳概括，為答案。

　　31. According to the passage, why was Pearl Buck considered an unusual figurein American literature?

　　【解析】選[A]。文中提到，Many of those books were set in China... Her books and her life served as a bridge between the cultures of the East and the West，由此可知，賽珍珠之所以被認(rèn)為是美國(guó)文學(xué)史上的非凡人物是因?yàn)樗�的�?xiě)作主要涉及一種完全不同的文化，[A]項(xiàng)正確。

　　32. What is the author’s attitude toward Pearl Buck?

　　【解析】選[B]。作者在文中介紹賽珍珠時(shí)，頻頻流露出欽佩贊賞的語(yǔ)氣，如One of the most popular literary figures in American literature，an unusually interesting and versatile human being, honored in her lifetime, a famous author, a fascinating subject of study...，因此本題答案為[B]。

　　Passage Three

　　Millions of years ago, whales lived on land and walked on four legs. Today, whales still have small bones that are the remains of their hind legs, but these bones can only be seen on the inside of the whale. No one knows why whales left the land to live in the water.

　　However, scientists can imagine that when the whales changed their environment, their bodies underwent a change — taking on a more fish-like appearance. This new form offered less resistance to the water, enabling the whales to swim faster.

　　Despite their fish like form, whales are not fish. A whale will drown, just as a man will, if it stays under water too long. When a whale is under water, it closes its nostrils tightly and holds its breath. The air in its lungs becomes very hot and full of water vapor. When the whale rises to the surface and exhales, its hot breath produces a column of water vapor that rises high in the air. A man produces the same effect when he exhales warm air on a cold morning.

　　Whales are classified as mammals because they bear their young, rather than laying eggs, and because the mother whales give the babies milk. Like other mammals, whales have warm blood. Their blood stays at the same temperature, even when they move from hot to cold water. They keep warm in cold water because they have a thick layer of fat just under their skins. This fat is called blubber, and it is thicker on whales that spend their lives in cold water. Almost all land mammals, except man, have hair on their bodies to keep them warm, but whales, which have very few hairs, are kept warm by their fat.

　　Questions 33 to 35 are based on the passage you have just heard.

　　33. How does a whale keep itself warm?

　　【解析】選[A]。根據(jù)文中提到的they keep warm because they have a thick layer of fat just under their skins可知，鯨靠皮下的一層厚厚的脂肪取暖，[A]為答案。

　　34. What do we learn about the blood temperature of a whale?

　　【解析】選[B]。文中提到的Their blood stays at the sane temperature, even...表明，鯨的體溫是衡定不變的，選項(xiàng)[B]正確。

　　35. In what way do whales distinguish themselves from other land mammals?

　　【解析】選[A]。從短文的末句Almost all land mammals, except man, have hair on their bodies to keep them warm, but whales, which have very few hairs, are kept warm by their fat可以得知，鯨和其他哺乳動(dòng)物的區(qū)別在于：其他哺乳動(dòng)物靠身上的毛取暖，而鯨魚(yú)身上幾乎沒(méi)有毛。選項(xiàng)[A]為答案。

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