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[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.

1.What is the main idea of the text？(no more than 10 words)________________________

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.

3.Fill in the blank in Paragraph 2 with proper words.(no more than 5 words)

___________                                                                

4.What can cause intelligence difference？(no more than 8 words)

　　________________________________________________________________________

5.What does the word "they" (Line 2, Paragraph 3) probably refer to？(no more than 8 words)

________________________________________________________________________

 

—I don't like him,________?

　    —No, I don't at all.

　A．do I　　　 　B．do you　　　 C．don't I　　　   D．does she

Like many of my generation, I have a weakness for hero worship. At some point, however, we all begin to question our heroes and our need for them. This leads us to ask: What is a hero?

　　Despite immense differences in cultures, heroes around the world generally share a number of characteristics that instruct and inspire people.

　　A hero does something worth talking about. A hero has a story of adventure to tell and a community who will listen. But a hero goes beyond mere fame.

　　Heroes serve powers or principles larger than themselves. Like high-voltage(电压) transformers, heroes take the energy of higher powers and step it down so that it can be used by ordinary people.

　　The hero lives a life worthy of imitation. Those who imitate a genuine hero experience life with new depth, enthusiasm, and meaning. A sure test for would-be heroes is what or whom do they serve? What are they willing to live and die for? If the answer or evidence suggests they serve only their own fame, they may be famous persons but not heroes. Madonna and Michael Jackson are famous, but who would claim that their fans find life more abundant?

　　Heroes are catalysts (催化剂) for change. They have a vision from the mountaintop. They have the skill and the charm to move the masses. They create new possibilities. Without Gandhi, India might still be part of the British Empire. Without Rosa Parks and Martin Luther King, Jr., we might still have segregated(隔离的) buses, restaurants, and parks. It may be possible for large-scale change to occur without leaders with magnetic personalities, but the pace of change would be slow, the vision uncertain, and the committee meetings endless.

1. Although heroes may come from different cultures, they _______.

　　A. generally possess certain inspiring characteristics

　　B. probably share some weaknesses of ordinary people

　　C. are often influenced by previous generations

　　D. all unknowingly attract a large number of fans

2. According to the passage, heroes are compared to high-voltage transformers in that ____.

　　A. they have a vision from the mountaintop

　　B. they have warm feelings and emotions

　　C. they can serve as concrete(具体的) examples of noble principles

　　D. they can make people feel stronger and more confident

3. Madonna and Michael Jackson are not considered heroes because ________.

　　A. they are popular only among certain groups of people

　　B. their performances do not improve their fans morally

　　C. their primary concern is their own financial interests

　　D. they are not clear about the principles they should follow

4. Gandhi and Martin Luther King are typical examples of outstanding leaders who ___.

　　A. are good at demonstrating their charming characters

　　B. can move the masses with the skill and the charm

　　C. are capable of meeting all challenges and hardships

　　D. can provide an answer to the problems of their people

5. The author concludes that historical changes would ______.

　　A. be delayed without leaders with inspiring personal qualities

　　B. not happen without heroes making the necessary sacrifices

　　C. take place if there were heroes to lead the people

　　D. produce leaders with attractive personalities