30. What is the author’s main purpose in the passage?
【解析】选[C]。本文除了历数赛珍珠(Pearl Buck)的文学成就外，主要介绍了她的写作背景(a product of two cultures)以及她广泛的兴趣关注(a wife and mother, an internationally famous writer and a humanitarian and a charitable person)。选项[C]是对此的最佳概括，为答案。
31. According to the passage, why was Pearl Buck considered an unusual figurein American literature?
【解析】选[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，赛珍珠之所以被认为是美国文学史上的非凡人物是因为她的写作主要涉及一种完全不同的文化，[A]项正确。
32. What is the author’s attitude toward Pearl Buck?
【解析】选[B]。作者在文中介绍赛珍珠时，频频流露出钦佩赞赏的语气，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...，因此本题答案为[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】选[A]。根据文中提到的they keep warm because they have a thick layer of fat just under their skins可知，鲸靠皮下的一层厚厚的脂肪取暖，[A]为答案。
34. What do we learn about the blood temperature of a whale?
【解析】选[B]。文中提到的Their blood stays at the sane temperature, even...表明，鲸的体温是衡定不变的，选项[B]正确。
35. In what way do whales distinguish themselves from other land mammals?
【解析】选[A]。从短文的末句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，鲸和其他哺乳动物的区别在于：其他哺乳动物靠身上的毛取暖，而鲸鱼身上几乎没有毛。选项[A]为答案。
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