D
Far from the land of Antarctica(南極洲), a huge shelf of ice meets the ocean. At the underside of the shelf there lives a small fish, the Antarctic cod.
For forty years scientists have been curious about that fish. How does it live where most fish would freeze to death? It must have some secret. The Antarctic is not a comfortable place to work and research has been slow. Now it seems we have an answer.
Research was begun by cutting holes in the ice and catching the fish. Scientists studied the fish’s blood and measured its freezing point.
The fish were taken from seawater that had a temperature of -1.88℃ and many tiny pieces of ice floating in it. The blood of the fish did not begin to freeze until its temperature was lowered to -2.05℃. That small difference is enough for the fish to live at the freezing temperature of the ice-salt mixture.
The scientists’ next research job was clear: Find out what in the fish’s blood kept it from freezing. Their search led to some really strange thing made up of a protein(蛋白質(zhì)) never before seen in the blood of a fish. When it was removed, the blood froze at seawater temperature. When it was put back, the blood again had its antifreeze quality and a lowered freezing point.
Study showed that it is an unusual kind of protein. It has many small sugar molecules(分子) held in special positions within each big protein molecule. Because of its sugar content, it is called a glycoprotein. So it has come to be called the antifreeze fish glycoprotein, or AFGP.
68. What is the text mainly about?
A. The terrible conditions in the Antarctic.
B. A special fish living in freezing waters.
C. The ice shelf around Antarctica.
D. Protection of the Antarctic cod.
69. Why can the Antarctic cod live at the freezing temperature?
A. The seawater has a temperature of -1.88℃.
B. It loves to live in the ice-salt mixture.
C. A special protein keeps it from freezing.
D. Its blood has a temperature lower than -2.05℃.
70. What does the underlined word “it” in Paragraph 5 refer to?
A. A type of ice-salt mixture.         B. A newly found protein.
C. Fish blood.                               D. Sugar molecule.
71. What does “glycol-” in the underlined word “glycoprotein” in the last paragraph mean?
A. sugar                  B. ice                    C. blood                D. Molecule

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源： 題型：

--- Aren’t you cold?

   --- ______. I’m boiling.

   A. Take it easy             B. That’s all right

   C. Not a little             D. Far from it

查看答案和解析>>

科目：高中英語 來源：牛津高三模塊十unit2單元測試題 題型：完型填空

完形填空（共20小題；每小題1分，滿分20分）

The winter skies are grey and it’s cold outside. The nights come early and we spend a lot more time  16   and alone. Many people   17   winter: so cold, so dark, so boring. But I like winter because I have more time to read.

For many students reading means school; it means   18  . Reading is something your teacher assigns and it’s something you’re   19  . Reading is something you have to do, not something you want to do. But for me and many other people, reading is the most   20   thing we can imagine. Getting lost in a good book can   21   a cold winter evening disappear. Dull grey skies are no   22  for the fantastic adventures of Frodo in The Lord of the Rings《指環(huán)王》，or for romantic trouble-making of Jane Austen’s Emma《愛瑪》, or for the youthful problems of Holden Caulfield in The Catcher in the Rye《麥田守望者》.

All of those books are studied in North American high schools. They are interesting and well written books that   23   young people.   24  , even there, many high school students don’t enjoy reading the books because they are   25   their school work: “Oh, my God! Two hundred pages! I’ll never be able to read   26   much.” But sometimes a funny thing happens. They begin to read and they begin to follow the   27  . Suddenly, the world inside the book becomes more exciting and more wonderful than the world they   28  . At the moment the thought   29   reading is work disappears and reading becomes   30  .

Reading anything is   31   but reading good books is a terrific way to improve your English. Good writers write English very well and   32   you with good examples to follow. And good books will tell you more about English   33  : what people think, how they talk, how they interact with each other. But don’t let me  34   it by telling you that reading is good for you. Just think of it as a good way to   35   on a cold winter evening.

16. A. indoors                   B. indoor                            C. outdoors              D. outside

17. A. like                           B. prefer                                      C. hate                      D. love

18. A. job                            B. worry                                       C. try                          D. work

19. A. tested                     B. tested on                      C. examined             D. examined on

20. A. enjoyable            B. reasonable                             C. comfortable      D. considerable

21. A. want                        B. cause                                       C. make                     D. force

22. A. contest                   B. challenge                      C. competition        D. match

23. A. appeal to                B. respond to                             C. react to                D. reply to

24. A. Fortunately B. Luckily                            C. Unfortunately      D. Accidentally

25. A. free from                B. part of                            C. in place of            D. far from

26. A. not                           B. very                                C. those                    D. that

27. A. story                        B. subject                           C. instruction            D. theme

28. A. leave for                 B. care about                             C. flee from              D. live in

29. A. what                        B. that                                C. this                        D. which

30. A. a comfort               B. a failure                         C. a success             D. a pleasure

31. A. bad                          B. mean                              C. great                     D. grand

32. A. provide                   B. offer                               C. give                       D. award

33 A. custom                     B. language                       C. culture                  D. art

34. A. break                       B. spoil                                C. make                     D. develop

35. A. keep warm            B. stand still                      C. stay calm             D. stay cool

 

查看答案和解析>>

科目：高中英語 來源：2011山西省介休市高三模擬考試英語試題 題型：單項(xiàng)填空

. I think that this film is _______ a film, it is also a good material for education.

A. more than       B. not less than       C. at least          D. far from

 

查看答案和解析>>

科目：高中英語 來源：2010年山東省高三4月考試英語試題 題型：單項(xiàng)填空

—You’re not angry then?

—______. I’ve never laughed so much in my life.

A. You’re joking                                 B. You’ve made it

C. That’s all right                                D. Far from it

 

查看答案和解析>>

同步練習(xí)冊答案