题目内容
we humans are alone in the universe,scientists have scanned the sky for outer space signals and sent messages out into space.
A、We wonder if B、Having known that
C、To find out whether D、Not knowing why
C
金版课堂课时训练系列答案
单元全能练考卷系列答案
新黄冈兵法密卷系列答案
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
完形填空（共15小题；每小题2分，满分30分）
阅读下面短文，掌握其大意，然后从下列各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
The human nose is an underestimated tool. Humans are often thought to be 1___ smellers compared with animals, but this is largely because, unlike animals, we stand upright. This means that our noses are 2 to detecting those smells which float through the air, 3 the majority of smells which stick to surfaces. In fact though, we are extremely sensitive to smells, even if we do not generally realize it. Our noses are capable of 4 human smells even when these are 5 to far below one part in one million.
6 , some people find that they can smell one type of flower but not another, while others are sensitive to the smells of both flowers. This may be because some people do not have the genes necessary to generate 7 smell receptors in the nose. These receptors are the cells which sense smells and send 8 to the brain. However, it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when 9 to it often enough.
The 10 for insensitivity to smell seems to be that brain finds it 11 to keep all smell receptors working all the time but can 12 new receptors if necessary. This may also explain why we are not usually sensitive to our own smells we simply do not need to be. We are not 13 of the usual smell of our own house but we 14 new smells when we visit someone else's. The brain finds it best to keep smell receptors _ 15 for unfamiliar and emergency signals such as the smell of smoke, which might indicate the danger of fire.
| 1. A. sensitive | B. outstanding | C. insensitive | D. awkward |
| 2. A. limited | B. committed | C. devoted | D. conducted |
| 3. A. catching | B. ignoring | C. missing | D. tracking |
| 4. A. distinguishing | B. discovering | C. determining | D. detecting |
| 5. A. reduced | B. reserved | C. rescued | D. refused |
| 6. A. Fortunately | B. Strangely | C Happily | D. Amazingly |
| 7. A. unusual | B. particular | C. unique | D. typical |
| 8. A. signs | B. information | C. messages | D. signals |
| 9. A. subjected | B. left | C. drawn | D. exposed |
| 10A. expectation | B. expression | C. extension | D. explanation |
| 11.A convenient | B. competitive | C. inefficient | D. adequate |
| 12.A introduce | B. gather | C. develop | D. produce |
| 13.A sure | B. sick | C. aware | D tired |
| 14.A tolerate | B. resist | C. neglect | D. notice |
| 15.A available | B. reliable | C. valuable | D. suitable |
“Humans should not try to avoid stress any more than they would shun food, love or exercise.” said Dr. Hans Selye, the first physician to document the effects of stress on the body. While here’s no question that continuous stress is harmful, several studies suggest that challenging situations in which you’re able to rise to the occasion can be good for you.
In a 2001 study of 158 hospital nurses, those who faced considerable work demands but coped with（设法处理） the challenge were more likely to say they were in good health than those who felt they couldn’t get the job done.
Stress that you can manage may also boost immune(免疫的) function. In a study at the Academic Center for Dentistry in Amsterdam, researchers put volunteers through two stressful experiences. In the first, a timed task that required memorizing a list followed by a short test, subjects believed they had control over the outcome. In the second, they weren’t in control: They had to sit through a gory(血淋淋的) video on surgical procedures. Those who did go on the memory test had an increase in levels of immunoglobulin A, an antibody that's the body’s first line of defense against germs. The video-watchers experienced a downturn in the antibody.
Stress prompts the body to produce certain stress hormones（荷尔蒙）. In short bursts these hormones have a positive effect, including improved memory function. “They can help nerve cells handle information and put it into storage,” says Dr. Bruce McEwen of Rockefeller University in New York. But in the long run these hormones can have a harmful effect on the body and brain.
“Sustained stress is not good for you,” says Richard Morimoto, a researcher at Northwestern University in Illinois studying the eff
ects of stress on longevity(长寿), “It’s the occasional burst of stress or brief exposure to stress that could be protective.”
【小题1】The passage is mainly about ________.
| A．the benefits of manageable stress |
| B．how to avoid stressful situations |
| C．how to cope with stress effectively |
| D．the effects of stress hormones on memory |
_____.| A．cut down on |
| B．stay away from |
| C．run out of |
| D．put up with |
| A．people under stress tend to have a poor memory |
| B．people who can’t get their job done experience more stress |
| C．doing challenging work may be good for one’s health |
| D．stress will weaken the body’s defense against germs |
| A．a person’s memory is determined by the level of hormones in his body |
| B．stress hormones have lasting positive effects on the brain |
| C．short bursts of stress hormones enhance memory function |
| D．a person’s memory improves with continued experience of stress |
Sydney—A shark savaged a schoolboy's leg while he was surfing with his father at a beach in Sydney on February 23.It was the third shark attack along the coast of Australia's largest city in a month.
The 15-year-old boy and his father were in the water off Avalon，on Sydney's northern beaches，around dawn when he was attacked.The city's beaches are packed with locals and tourists during the summer months.
“The father heard a scream and turned to see his son thrashing(激烈扭动)about in the water，”the police said.“Fortunately，the shark swam away and the boy was helped to the shore by his father.”
Lifesaving Club spokesman Nick Miller said，“It got him around the top of his left leg and the father came and dragged him out of water.”He said the boy was bleeding heavily when he was brought to the shore.“There was a lot of pain，as you can imagine.”The teenager was airlifted to hospital for treatment for leg injuries.
Police said the bites “cut through to the bone”，but the boy did not appear to have sustained any fractures (骨折)．He was in a stable condition now.
Several beaches were closed after the attack.Water police and lifeguards were searching for the shark，while the police hoped to identify its species by the shape of the bite marks.But they said it was too early to say what type of shark attacked the boy.“I don't even know if he saw it，”Miller said.
Many shark species live in the waters off Sydney's beaches，but attacks on humans are still relatively rare.However，there were two attacks on successive days earlier this month，one on a navy diver in Sydney harbor，not far from the famous Opera House，and the other on a surfer at the city's world-famous Bondi beach.
Fishermen say shark numbers are on the rise.There is a ban on commercial fishing in the harbor，which has increased fish stocks.Marine experts also claim environmental protection has created a cleaner environment，attracting sharks closer to the shore as they chase fish.Many shark species，including the Great White—the man-eaters made famous in Steven Spielberg's Jaws—are protected in Australian waters.
1.The report mainly tells us ________.
|
A．shark attacks on humans are on the rise |
|
B．sharks attacked humans three times in one month |
|
C．a boy was attacked by a shark at a Sydney beach |
|
D．shark numbers are increasing in the waters off Sydney's beaches |
2.The underlined word “savaged” in the first paragraph probably means “________”．
|
A．attracted |
B．dragged |
C．bit |
D．packed |
3.What do we know about the city of Sydney from the passage?
B．Sydney harbor is not far from the famous Opera House.
C．There are many locals and tourists on its coast all the year round.
D．There are few shark species in the waters off Sydney's beaches.
4.About the injury of the boy we know that ________.
|
A．he was losing much blood when he was dragged out |
|
B．he was very nervous when he was sent to hospital |
|
C．he may be in danger of losing his leg |
|
D．he was injured in the right leg |
5.All the following are the causes of Australia's sharks' increasing EXCEPT that ________.
|
A．environmental protection has created a cleaner environment |
|
B．a ban on commercial fishing has increased fish numbers |
|
C．many shark species are protected in Australian waters |
|
D．the film Jaws has made the Great White famous |