Have you ever wondered why birds sing? Maybe you thought that they were just happy. After all ,you probably sing or whistle when you are happy.

       Some scientists believe that birds do sing some of the time just because they are happy. However ,they sing most of the time for a very different reason .Their singing is actually a warning to other birds to stay out of their territory.

       Do you know what a “territory” is? A territory is an area that an animal ,usually the male, claims（声称）as its own .Only he and his family are welcome there .No other families of the same species（物种）are welcome. Your yard and house are your territory where only your family and friends are welcome. If a stranger should enter your territory and threaten you, you might shout. Probably this would be enough to frighten him away.

       If so, you have actually scared the stranger away without having to fight him .A bird does the same thing. But he expects an outsider almost any time ,especially at nesting（筑巢）season. So he is screaming all the time, whether he can see an outsider or not .This screaming is what we call a bird’s song, and it is usually enough to keep an outsider away.

       Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs.

       You can see that birds have a language all their own. Most of it has to do with attracting mates and setting up territories.

56．Some scientists believe that most of the time birds’ singing is actually       .

       A．an expression of happiness                   B．a way of warning

       C．an expression of anger                         D．a way of greeting

57．What is a bird’s “territory”?

       A．A place where families of other species are not accepted.

       B．A place where a bird may shout at the top of its voice.

       C．An area for which birds fight against each other.

       D．An area which a bird considers to be its own.

58．Why do birds keep on singing at nesting season?

       A．Because they want to invite more friends.

       B．Because their singing helps frighten outsiders away.

       C．Because they want to find outsiders around.

       D．Because their singing helps get rid of their fears.

59．How does the writer explain birds’ singing?

       A．By comparing birds with human beings.

       B．By reporting experiment results.

       C．By describing birds’ daily life.

       D．By telling a bird’s story.

阅读下面短文，并根据短文后的要求答题（请注意问题后的字数要求）。
[1]Global difference in intelligence is a sensitive topic, long filled with a large number of different opinions. But recent data has indeed shown cognitive (认知的) ability to be higher in some countries than in others. What's more, IQ scores have risen as nations develop—a phenomenon known as the "Flynn effect". Many causes have been put forward for both the intelligence difference and the Flynn effect, including education, income, and even non-agricultural labor. Now, a new study from researchers at the University of New Mexico offers another interesting theory: intelligence may be linked to infectious-disease rates.
　　[2]The brain, say author Christopher Eppig and his colleagues, is the "most costly organ in the human body". Brainpower consumes almost up to 90 percent of a newborn's energy. It's clear that if something affects energy intake while the brain is growing, the impact could be long and serious. And for vast parts of the globe, the biggest threat to a child's body—and therefore brain—is parasitic (由寄生虫引起的) infection. These illnesses threaten brain development________________. They can directly attack live tissue, which the body must then try every means to replace. They can invade the digestive pipe and block nutritional intake. They can rob the body's cells for their own reproduction. And then there's the energy channeled (输送) to the immune system to fight the infection.
　　[3]Using data on national "disease burdens" (life years lost due to infectious diseases) and average intelligence scores, the authors found they are closely associated. The countries with the lowest average IQ scores have the highest disease burdens without exception. On the contrary, nations with low disease burdens top the IQ list.
　　[4]If the study holds water, it could be revolutionary for our understanding of the still-confusing variation in national intelligence scores.
【小题1】What is the main idea of the text？(no more than 10 words)________________________
【小题2】Complete the following statement with proper words.(no more than 4 words)
　　Those countries that have the ________________ are always at the bottom of the  IQ list.
【小题3】Fill in the blank in Paragraph 2 with proper words.(no more than 5 words)
___________                                                                
【小题4】What can cause intelligence difference？(no more than 8 words)
　　________________________________________________________________________
【小题5】What does the word "they" (Line 2, Paragraph 3) probably refer to？(no more than 8 words)
________________________________________________________________________

For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.

Over the past few decades, more and more countries have opened up their markets, increasingly transforming the world economy into one free-flowing global market. The question is: Is economic globalization   50   for all?

According to the World Bank, one of its chief supporters, economic globalization has helped reduce   51   in a large number of developing countries. It quotes one study that shows increased wealth   52   to improved education and longer life in twenty-four developing countries as a result of integration (融合）of local economies into the world economy. Home some three billion people, these twenty-four countries have seen incomes   53   at an average rate of five percent—compared to two percent in developed countries.

Those who   54   globalization claim that economies in developing countries wilt from new opportunities for small and home-based businesses.   55   , small farmers in Brazil who produce nuts that would originally have sold only in   56   open-air markets can now promote their goods worldwide by the Internet.

Critics take a different view, believing that economic globalization is actually   57   gap between the rich and poor. A study carried out by the U.N.-sponsored World Commission on the Social Dimension of Globalization shows that only a few developing countries have actually.   58   from integration into the world economy and that the poor, the uneducated, unskilled workers, and native peoples have been left behind.   59   , they maintain that globalization may eventually threaten emerging businesses. For example, Indian craftsmen who currently seem to benefit from globalization because they are able to   60   their products may soon face fierce competition that could put them out of   61   . When large-scale manufacturers start to produce the same goods, or when superstores like Wal-Mart move in, these small businesses will not be able to   62   and will be crowded out.

One thing is certain about Globalization—there is no   63   . Advances in technology combined with more open policies have already created an interconnected world. The   64   now is finding a way to create a kind of globalization that works for the benefit of all.

50. A. possible               B. smooth              C. good                 D easy

51. A. crime                  B. poverty              C. conflict              D. population

52. A. contributing         B. responding         C. turning              D owing

53. A. remain                B. drop                  C. shift                  D. increase

54. A. doubt                  B. define                C advocate             D. ignore

55. A. In addition           B. For instance       C. in other words    D. All in all

56. A. mature                B. new                  C. local                  D. foreign

57. A. finding                B. exploring           C. bridging             D. widening

58. A. suffered              B. profited             C. learned              D. withdrawn

59. A. Furthermore        B. therefore            C. However            D. Otherwise

60. A. consume             B. deliver               C. export               D. advertise

61. A. trouble                B. business            C power                D. mind

62. A. keep up               B. come in             C. go around         D. help out

63. A. taking off            B. getting alone       C. holding out         D. turning back

64. A. agreement           B. prediction          C. outcome            D. challenge

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多于选项。

 1. Maybe you thought that they were just happy. After all, you probably sing or whistle when you are happy.

Some scientists believe that birds do sing some of the time just because they are happy.

However, they sing most of the time for a very different reason. 2.  Do you know what a “territory” is? A territory is an area that an animal, usually the male, claims as its own. 3. . No other families of the same species are welcome. Your yard and house are your territory where only your family and friends are welcome. If a stranger should enter your territory and threaten you, you might shout. Probably this would be enough to frighten him away.

If so, you have actually scared the stranger away without having to fight him. A bird does the same thing. But he expects an outsider almost any time, especially at nesting season. So he is screaming all the time, whether he can see an outsider or not.  4. 

Birds sing loudest in the spring when they are trying to attract a mate and warn others not to enter the territory of theirs. You can see that birds have a language all their own. 5.

A. Only he and his family are welcome there. www.jk.zy.w.com

B. Most of it has to do with attracting mates and setting up territories.

C. Have you ever heard birds sing?

D. Their singing is actually a warning to other birds to stay out of their territory.

E. Have you ever wondered why birds sing?

F. Most of the language is widely used.

G. This screaming is what we call a bird’s song, and it is usually enough to keep an outsider away.