D．the fitter participants gave more accurate answers
34．It can be good for health when one takes a walk every 2 or 3 days for at least______．
A．3 minutes
B．45 minutes
C．30 minutes
D．10 minutes
35．It is suggested in the last paragraph that people should______．
A．run around once a week
B．not read and walk at the same time
C．go for a walk every day
D．not hurt their friends while exercising
第二篇
Night of the Living Ants
When an ant dies，other ants move the dead insect out of the nest．This behavior is interesting to scientists，who wonder how ants know for sure and so soon that another ant is dead．
Dong-Hwan Choe，a scientist at the University of California found that Argentine ants have a chemical on the outside of their bodies that signals to other ants．"I'm dead．take me away．"
But there's a twist to Choe's discovery．These ants ave a little bit like zombies(僵尸)．Choe says that the living ants，not just the dead ones，have this death chemicals．In other words．While an ant crawls around，perhaps in a picnic or home，it's telling other ants that it's dead．
What keeps ants from hauling away the liring dead?Choe found that Argentine ants have two additional chemicals on their bodies，and these tell nearby ants something like，"Wait-I'm not dead yet，"So Choe's research turned up two sets of chemical signals in ants：one says，"I'm dead．"the other set says，"I'm not dead yet．"
Other scientists have tried to figure out how ants know when another ant is dead． If an ant is knocked unconscious，other ants leave it alone until it wakes up．That means ants know that unmoving ants can still be alive．
Choe suspects that when an Argentine ant dies，the chemical that says"Wait-I'm not dead yet" quickly goes away.Once that chemical is gone，only the one that says"I'm dead"is left．"It's because the dead ant no longer smells like a living ant that it gets carried to the graveyard(墓地)，not because its body releases new unique chemicals after death，"said Choe． When other ants detect the"dead"chemical without the"not dead yet"chemical，they haul away the body． This was choe's hypothesis(假设)．
To test his hypothesis，Choe and his team put different chemicals on Argentine ant pupae(蛹). When the scientists used the"I'm dead"chemical，other ants quickly hauled tbe treated pupae away. When the scientists used the"Wait-I'm not dead yet"chemicals，other ants left the treated pupae alone.Choe believes this behavior shows that the"not dead yet"chemicals override(优先于) the"dead"chemical when picked up by adult ants． And that when an ant dies，the"not dead yet"chemicals fade away．Other nearby ants then detect the remaining"dead"chemical and remove the body from the nest． (www.qidian55.com)编辑整理
36．What is meant by"death chemical"mentioned in paragraph 3?
A．A chemical that contains poison．
B．A chemical that causes death．
C．A chemical that announces death．
D．A chemical that prevents death．
37．Which of the following statements is NOT true of ants?
A．Ants know very soon that another ant is dead．
B．When an ant is dead，others move its body out of the nest．
C．If an ant is unconscious，it is moved out of the nest．
D．Living ants have the"I'm dead"chemical on their bodies．
38．According to Choe's hypothesis，___________.
A．an ant still smells like a living when it dies
B．the"I am dead"chemical leaves the ant's body when it dies
C．the"I am not dead yet"chemical is left when an ant dies
D．the"I am not dead yet"chemical leaves the ant's body when it dies
39．According to paragraph 7，what is the result of the test on Choe's hyothesis?
A．It shows that his hypothesis is wrong．
B．It proves that his hypothesis is convincing．
C．It suggests that his hypothesis needs revising．
D．Not enough evidence has been found to support his hypothesis．
40．The passage"Night of the Living Ants"tells us about________.
A．how an ant is moved out of the nest at nigh
B．what an ant does at night
C．how an ant finds its way in darkness
D．what happens when an ant dies
第三篇
The Iceman
On a September day in 1991，two Germans were climbing the mountain between Austria and Italy．High up on a mountain pass，they found the body of a man lying on the ice. At that height (10,499 feet or 3，200 meters)，the ice is usually permanent，but 1991 had been an especially warm year．The mountain ice had melted more than just usual and so the body had come to the surface．
It was lying face downward．The skeleton(骨架)was in perfect condition，except for a wound in the head．There was still skin on the bones and the remains of some clothes．The hands were still holding the wooden handle of an ax and on the feet there were very simple leather and cloth boots．Nearby was a pair of gloves made of tree bark(树皮)and a holder for arrows．
Who was the man? How and when had he died? Everybody had a different answer to these questions．Some people thought that it was from this century，perhaps the body of a soldier who died in World War I．since several soldiers had already been found in the area． A Swiss woman who believed it might be her father, who had died in those mountains twenty years before and whose body had never been found．The scientists who rushed to look at the body thought it was probably much older，maybe even a thousand years old．
With modern dating techniques，the scientists soon learned that the iceman was about 5，300 years old．Born in about 3300 B．C．，he lived during the Bronze Age in Europe．At first scientists thought he was probably a hunter who had died from an accident in the high mountains. More recent evidence．however，tells a different story．A new kind of X-ray shows an arrowhead still stuck in his shoulder．It left only a tiny hole in his skin，but it caused internal damage and bleeding．He almost certainlv died from this wound，and not from the wound on the back of his head．This means that he was probably in some kind of battle．It may have been part of a large war，or he may have been fighting bandits．He may even have been a bandit himself．
，2010年全国职称英语理工类（B级）考试真题及答案