C
Recently scientists have worked out a way to judge roughly where a person has lived using strands(缕) of hair, a technique that could help track the movements of criminal suspects or unidentified bodies .
The method depends on measuring how chemical variations in drinking water show up in people’s hair.
While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as clouds move.
Most hydrogen and oxygen atoms in water are stable , but traces of both elements are also present as heavier isotopes (同位素) . The heaviest raid（列阵）falls first. As a result, storms that form over the Pacific deliver heavier water to California than to Utah.
Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can establish a geographic timeline. Each inch of hair corresponds to about two months.
Cerling’s team collected tap water samples from 600 cities and constructed a frame of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops. They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of raid systems.
“It’s not good for pinpointing (精确定位),” he said. “It’s good for ruling out many possibilities.”
64. What can we learn from the passage about the latest discovery?
A. One’s hair growth has to do with the amount of water they drink.
B. A person’s hair may reveal where they have lived.
C. Hair analysis identifies criminal suspects accurately.
D. The chemical composition of hair varies from person to person.
65. What does the underlined word “identical” in paragraph 3 probably mean?
A. similar B. fantastic C. beneficial D. healthy
66. What is the practical value of Cerling’s research?
A. It helps analyze the quality of water in different regions.
B. It helps the police determine where a crime is committed.
C. It helps the police narrow down possibilities in detective work.
D. It helps identify the drinking habits of the person under investigation.
If you are planning on traveling, there are a few simple rules about how to make life easier both before and after your journey.
First of all, always check and doublecheck departure (出发) time. It is surprising how few people really do this carefully. Once I arrived at the airport a few minutes after ten. My secretary had got the ticket for me and I thought she had said that the plane left at 10：50. When I arrived at the airport, the person at the departure desk told me that my flight was closed. Therefore, I had to wait three hours for the next one and missed an important meeting.
The second rule is to remember that even in this age of credit cards (信用卡), it is still important to have some local money in cash (现金). Once I arrived at a place at midnight and the bank at the airport was closed. The only way to get to my hotel was by taxi but because I had no dollars, I offered to pay in pounds instead. “Listen! I only take real money！” the driver said angrily. You can imagine how terrible I felt at that moment.
The third and the last rule is to find out as much as you can about the weather at your destination before you leave. I feel sorry for some of my workmates who travel in heavy suits and raincoats in May, when it is still fairly cool in London or Manchester, to places like Athens, Rome or Madrid, where it is already beginning to get quite warm during the day.
A．Britain. B．The USA.
C．Italy. D．Greece.
| A．asked the driver to give him a free ride |
| B．offered to pay in pounds |
| C．gave the driver some fake(假)money |
| D．tried to pay by credit card |
| A．warm and dry | B．cold and dry |
| C．hot and wet | D．cool and rainy |
| A．how to make life easier |
| B．how to be well prepared for a trip |
| C．how to enjoy ourselves on the trip |
| D．how to schedule our trip |
One night, the first floor of the house suddenly caught fire. The fire was big, and soon became a sea of fire. On the second floor lived a little girl and her grandmother; the little girl’s parents had died, and she lived together with her grandma. In order to rescue the little girl, the grandmother was burned to death, leaving the little girl crying for help loudly.
How could people enter the house? At the very moment, a man carrying a ladder rushed to the flames and got into the window. When he appeared again in the eyes of the people, the little girl was in his arms. He gave the child to the crowd, and then disappeared into the night.
This little girl had no family. Two months later a meeting was held to find a person to adopt (收养) the girl. A teacher was willing to adopt this child, and said she could give her the best education; a farmer wanted to adopt this child, saying that village life would let the child grow up healthily and happily; a rich man said, “I can give the child everything that others can do.”
A lot of people who wanted to adopt this child said about many benefits of their adopting the child. But the little girl’s face had no expression. At this time, a man, through the crowd, walked straight in front of the little girl, and opened his arms for the little girl. People were puzzled, and they found that the man had terrible scars on his arms. The little girl let out a cry, “This is the man who saved me!” She suddenly jumped up, and buried her face in his arms and sobbed. Naturally the man adopted the girl.Which of the following statements is TRUE?
| A．The grandma was too old to rush out of the room. |
| B．The little girl and her grandpa lived on the second floor. |
| C．To rescue the little girl, her grandma died in the fire. |
| D．The grandma and the little girl cried for help loudly on the first floor. |
What did the man do when he had saved the little girl?
| A．He returned to his work. |
| B．He left the girl to the crowd and left quickly. |
| C．He was injured and went to the hospital. |
| D．He took the girl home. |
The meeting was held there in order to .
| A．decide who would adopt the girl |
| B．find out who had rescued the girl |
| C．decide how the girl would be raised |
| D．honor the hero who had saved the girl |
What can we learn from the passage?
| A．People didn’t want to help the little girl at first. |
| B．The man who had saved the girl was a fireman. |
| C．The rich man would buy everything the girl needed. |
| D．The girl recognized the man and was happy to be adopted by him. |
A young man once went into town and bought himself a pair of trousers. When he got home, he went upstairs to his bedroom and put them on. He found that they were about two inches too long.
He came downstairs, where his mother and his two sisters were washing up tea things in the kitchen. “These new trousers are too long.” He said. “ They need shortening (缩短)by about two inches. Would one of you mind doing this for me, please?” His mother and sisters were busy and none of them said anything.
But as soon as his mother had finished washing up, she went quietly upstairs to her son’s bedroom and shortened the trousers by two inches. She came downstairs without saying anything to her daughters.
Later on, after supper, the elder sister remembered her brother’s trousers. She was a kind-hearted girl, so she went quietly upstairs without saying anything to anyone, and shortened the trousers by two inches.
The younger sister went to the cinema, but when she came back, she , too, remembered what her brother had said. So she ran upstairs and took two inches off the legs of the new trousers.
| A．as long as |
| B．two inches longer than |
| C．as big as |
| D．two inches shorter than |
| A．his mother and sisters |
| B．his two sisters |
| C．his elder sister |
| D．his mother and one of his sisters |
| A．after finished washing |
| B．before she went to bed |
| C．when she came back from the cinema |
| D．after having supper |
| A．two inches shorter |
| B．four inches shorter |
| C．six inches shorter |
| D．eight inches shorter |
It is difficult for doctors to help a person with a damaged brain. Without enough blood, the brain lives for only three to five minutes. More often the doctors can' t fix the damage. Sometimes they are afraid to try something to help because it is dangerous to work on the brain. The doctors might make the person worse if he operates on the brain.
Dr. Robert White, a famous professor and doctor, thinks he knows a way to help. He thinks doctors should make the brain very cold. If it is very cold, the brain can live without blood for 30 minutes. This gives the doctor a longer time to do something for the brain.
Dr. White tried his idea on 13 monkeys. First he taught them to do different jobs, then he operated on them. He made the monkeys' blood go through a machine. The machine cooled the blood. Then the machine sent the blood back to the monkeys' brains. When the brain' s temperature was 10°C, Dr. White stopped the blood to the brain. After 30 minutes he turned the blood back on. He warmed the blood again. After their operations the monkeys were like they had been before. They were healthy and busy. Each one could still do the jobs the doctor had taught them.
| A．the time is too short for doctors |
| B．the patients are often too nervous |
| C．the damage is extremely hard to fix |
| D．the blood-cooling machine might break down |
| A．taking the blood out of the brain |
| B．trying the operation on monkeys first |
| C．lowering the brain' s temperature |
| D．having the blood go through a machine |
a. send the cooled blood back to the brain
b. stop the blood to the brain
c. have the blood cooled down
d. operate on the brain
| A．a,b,c,d | B．c,a,b,d |
| C．c, b, d, a | D．b, c, d, a |
| A．can last as long as 30 minutes |
| B．can keep the brain's blood warm |
| C．can keep the patient's brain healthy |
| D．can help monkeys do different jobs |
Can dogs and cats live in perfect harmony in the same home? People who are thinking about adopting a dog as a friend for their cat are worried that they will fight. A recent research has found a new recipe of success. According to the study, if the cat is adopted before the dog, and if they are introduced when still young (less than 6 months for cats, a year for dogs), it is highly probable that the two pets will get along swimmingly. Two-thirds of the homes interviewed reported a positive relationship between their cat and dog.
However, it wasn’t all sweetness and light. There was a reported coldness between the cat and dog in 25% of the homes, while aggression(侵略，攻击性) and fighting were observed in 10% of the homes. One reason for this is probably that some of their body signals were just opposite. For example, when a cat turns its head away , it signals aggression , while a dog doing the same signals submission(屈服，顺从).
In homes with cats and dogs living peacefully, researchers observed a surprising behavior. They are learning how to talk each other’s language. It is a surprise that cats can learn how to talk ‘Dog’, and dogs can learn how to talk ‘Cat’.
What’s interesting is that both cats and dogs have appeared to develop their intelligence. They can learn how to read each other’s body signals, suggesting that the two may have more in common than we previously suspected. Once familiar with each other’s presence and body language, cats and dogs can play together, greet each other nose to nose, and enjoy sleeping together on the sofa. They can easily share the same water bowl and in some cases groom (梳理) each other.
The significance of the research on cats and dogs may go beyond pets ─ to people who don’t get along, including neighbors, colleagues at work, and even world superpowers. If cats and dogs can learn to get along, surely people have a good chance.
| A．early | B．sweetly |
| C．quickly | D．smoothly |
| A．they are cold to each other |
| B．they look away from each other |
| C．they misunderstood each other's signals |
| D．they are introduced at an early age |
| A．They eat and sleep each other. |
| B．They observe each other's behaviors. |
| C．They learn to speak each other's language. |
| D．They know something from each other's voices. |
| A．We should learn to live in harmony. |
| B．We should know more about animals. |
| C．We should live in peace with animals. |
| D．We should learn more body languages |