Scientists in Colombia have trained a team of rats to help remove land mines from the countryside. Land mines are small bombs hidden in the ground and designed to explode(爆炸) when someone steps on them.
When trained, the rats can smell special metals in the mines and then signal(发信号) to their human team. Then why use rats for such an important job?
In the past, dogs have been used to find bombs. Rats have a good sense of smell and can respond to orders, just like dogs do. But rats are much lighter than dogs. They stand less of a chance of setting off the mines, which explode under a certain amount of weight. What’s more, the best rats are cheaper to keep than dogs. It costs about the same amount of money to take care of one dog as it does 70 rats.
The rats have already been used in Tanzania, an African country with many land mines. Luisa Fernanda Méndez and her team in Colombia are training the even lighter Wistar rats. These are the white rats with red eyes that scientists often use in laboratory experiments. “They even train their babies to perform their jobs, which saves us a lot of time, ” Méndez said.
Colombia has the second-highest rate(比率) of deaths from land mine accidents in the world. Last year, land mines killed 695 people — 56 of whom were children. A criminal group called the Revolutionary Armed Forces of Colombia, or FARC, as well as other organizations, have placed the mines. FARC are strongly against Colombia’s government. The group has placed mines all around its own bases and in many places in the countryside.
In the past, the Colombian government hired peasants and poor farmers to find mines. Many of them died trying to find the well-hidden bombs.
Colombian police official Erick Guzmán hopes the team of rats can come to the rescue(援救). “These rats will be a great help,” he said.How do rats help to find land mines?
| A．By their special sight. | B．By their light weight. |
| C．By their sense of smell. | D．By their excellent hearing. |
The advantage of rats over dogs in finding bombs is that _____.
| A．they are cleverer. |
| B．they run faster |
| C．they have a better sense of smell |
| D．they don’t make mines explode as easily |
The underlined word “They” may refer to ______.
| A．scientists | B．Wistar rats |
| C．dogs | D．Méndez and her team |
What is the passage mainly about?
| A．Specially-trained rats help clear land mines. |
| B．People in Tanzania are suffering from land mines. |
| C．Dogs are no longer used to find land mines. |
| D．Land mines have become a great danger to Colombians. |
Apply for a Library Card
Any person who lives, works, attends school or pays property taxes in New York State is eligible to receive a New York Public Library card free of charge. Adult and teen users may either apply online or in person at any New York Public Library location. Applications for children ages 11 and under must be completed in person, and require the signature of a parent. When you apply for a card online, you will receive a 7-digit temporary barcode(条码). This allows you to set a secret code. After you receive your permanent barcode, which is required to borrow materials, search Library databases, or reserve a computer, you must renew your card.
Renew or Validate Your Card
All adult, teen and child library cards for cardholders must be renewed every three years. New library card applicants who applied for a card online must renew their card before full cardholder privileges can be extended. Cardholders can visit any New York Public Library location to present the required forms of identification in order to renew or validate their card. Cardholders may also email copies of the required forms of identification to patronaccounts@nypl.org. Alternatively, this information may be faxed to 212.621.0278.
Forget Your Secret Code?
If you forget your secret code, you can provide the library with a valid email address, and click on the link ---“Forgot Your secret code?” A link with instructions on changing your secret code will be sent to the email address on your account, giving you a brief period of time to update your information. You must select a 4 digit numeric secret code, with no repeating or obvious numbers (e.g. 1234 or 2222). If you have not provided us with a valid email address, you may visit a library location to reset your secret code.
Replace a Lost or Stolen Card
Cardholders are responsible for all items on a card, all use made of the card and all charges made against it until it is reported lost or stolen. If your card is lost or stolen, inform the library immediately. Call 917.ASK.NYPL (917.275.6975), email Ask NYPL, or visit to your nearest library to report the card lost.Who can’t apply for a New York Public Library card for free?
| A．Those who work in New York. |
| B．Those who travel in New York. |
| C．Those who live in New York. |
| D．Those who go there for further study. |
Children ages 11 and under________.
| A．are required to apply for a free library card online |
| B．must apply for a library card in person with a parent |
| C．should change their library cards every three years |
| D．can enjoy extended privileges before renewing the card |
Library cards may NOT be renewed _______.
| A．by email | B．by fax | C．by phone | D．in person |
Which of the following can be a secret code?
| A．1368 | B．5188 | C．5678 | D．8888 |
In the past decade the popularity of rock climbing has greatly increased, and so has the number of injuries. It has been estimated that rock climbing is now enjoyed by more than 9 million people in the US each year. Study findings revealed a 65% increase in the number of patients that were treated in US emergency departments for rock climbing-related injuries between 1991 and 2012.
The study, published in the online issue of the American Journal of Preventive Medicine, found that about 40,000 patients were treated in US emergency departments for rock climbing-related injuries between 1991 and 2012. The most common types of rock climbing –related injuries were fractures(骨折) and sprains （扭伤）。The ankle was the most common body part to be injured (40%). Climbers in the study ranged in age from 2 to 74, with an average age of 26. The study also found that women took up a quarter of the injuries.
Falls were the primary reason for injury with over three-quarters of the injuries occurring as the result of a fall. The severity of fall-related injuries had a lot to do with the height of the fall. Patients who were injured after falling from a height over 20 feet were 10 times more likely to be treated than patients who were injured falling from 20 feet or lower.
“We found that the climbers who fell from heights higher than 20 feet took up 70 percent of the patients treated for a rock climbing-related injury,” explained the study author Lara McKenzie, PhD, director at the Center for Injury Research and Policy at Nationwide Hospital. “This trend, combined with the fact that rock climbers have a higher hospitalization rate than other sports and recreational injuries, demonstrates the need to increase injury prevention efforts for climbers.”Which body part is most likely to get injured for a climber ?
| A．The arm | B．The knee |
| C．The ankle | D．The hand |
How many women climbers in American got injured while climbing a rock between 1991 and 2012 ？
| A．About 40,000 | B．About 30,000 |
| C．About 20,000 | D．About 10,000 |
The severity of climbers’ fall-related injures is mainly related to ______.
| A．the height of the fall. |
| B．the climber’s age. |
| C．the climber’s health condition |
| D．the climber’s climbing experience. |
The underlined word “demonstrates” in the last paragraph can be replaced by ________.
| A．denies | B．proves | C．prevents | D．describes |
A growing number of American homes are keeping African pygmy hedgehogs(刺猬) as pets. Hers are some questions and answers about the small animals whose backs and sides are covered with about 6,000 quills. Their quills are short, but hard and sharp.
Where do they come from?
The breed is a hybrid (杂种) of the four-toed hedgehog or African white-bellied hedgehog and the Algerian hedgehog. Its natural habitat is central, eastern and southern Africa. It now breaks the law to bring them into the United States.
An adult African pygmy hedgehog is 6 to 11 inches long and weighs 1 to 2 pounds. A relaxed one is generally oval (椭圆的) , with a very short tail and short limbs that keep the body close to the ground . When threatened or frightened, it rolls into a ball and forces its quills out in all directions. Female hedgehogs are a bit larger than the male ones. The face and the underside are covered with soft and white fur.
What do they eat?
In the wild, the hedgehog feeds mainly on insects. It also eats earthworms, snails and slugs, as well as small snakes and frogs. Pet owners feed cat food to hedgehogs that are kept at home by them.
How many babies can a mother hedgehog give birth to one time?
After hedgehogs get pregnant, it just takes about 35 days for them to give birth. Hedgehogs are born in babies of 2 to 10, each having white quills that do not injure the mother during birth. The US Department of Agriculture requires anyone breeding at least three hedgehogs to get a license.Paragraph 1 shows that keeping African pygmy hedgehogs as pets__ __.
| A．is very exciting but dangerous for pet owners |
| B．is becoming more and more popular in the US |
| C．is causing more and more troubles for pet owners |
| D．is the most popular with people in the United States |
What do we know about African pygmy hedgehogs?
| A．They usually live in eastern and northern Africa. |
| B．They like rolling away when threatened or frightened. |
| C．They are usually 6 inches long when they are born. |
| D．They are a new breed by two kinds of hedge-hogs. |
Which of the following can be used as the second subtitle?
| A．What do they look like? |
| B．How much do they weigh? |
| C．How long are their bodies? |
| D．How do they protect themselves? |
When African pygmy hedgehogs are born, they probably__ __.
| A．often influence their mother’s life |
| B．have very soft white quills |
| C．can look for insects within days |
| D．often become food of small snakes |
I was born into a family of five children. As the youngest child, I didn’t have many new clothes. Though my parents worked very hard, we could hardly make ends meet. The only time we would receive new clothes was at Christmas.
The family across the street lived a much better life. They just had two daughters and they were often seen wearing new dresses. The younger girl named Anna was of my age. One afternoon, she walked on the street wearing a beautiful white dress. She looked like an angel in that dress. I, together with many little girls, followed her. We just couldn’t keep our eyes off her dress. We all wished we would have such a dress one day!
That day, after coming back, I told my mom that I wanted a dress like that. My mom frowned(皱眉) she thought such a beautiful dress like that must cost an arm and a leg, but my mom kept that in mind. She worked five days a week at that time, but when Christmas was getting close, she worked even on every Saturday.
However, several days before Christmas, I changed my mind. It was Anna’s birthday that day and I was invited to her home with some other girls. After that party, I asked if I could try on her white dress. “Of course,” she said, “and you can take it if you like it.” I couldn’t believe my ears. How could she give such a beautiful dress to someone else? After trying it on, I knew why.
The dress looked beautiful, but it was uncomfortable to wear. As a matter of fact, my back was quite itchy(痒的) after I put it on. From that day on, I stopped admiring what others had. They may not be as good aswe think.When the writer was a little girl, she .
| A．couldn’t get whatever she liked |
| B．couldn’t see her parents at all |
| C．didn’t like new clothes |
| D．didn’t like Christmas that much |
When the other girls saw Anna’s dress, they thought it .
| A．too little | B．very cheap |
| C．very beautiful | D．very comfortable |
The writer’s mother started working on very Saturday because she .
| A．wanted to buy a new dress for herself |
| B．had to buy all her children expensive gifts |
| C．prepared herself for the busiest Christmas. |
| D．wanted to buy the dress the writer wanted |
From the passage, we learn that .
| A．there are always kind-hearted people around us |
| B．what others have may not be as good as we think |
| C．we should give what we no longer need to others |
| D．we can get what we want if we try hard enough |
We take it for granted that with memory we can remember most of things which happened in our life. But it is difficult to imagine what life would be like without memory. The meanings of thousands of everyday perceptions(感知), the basis for the decisions we make, and the roots of our habits and skills are to be found in our past experiences, which are brought into the present by memory.
Memory can be defined as the ability to keep information available for later use. It not only includes “remembering” things like arithmetic(算术) or historical facts, but also involves any change in the way an animal typically behaves. Memory is involved when a rat gives up eating grain because he has sniffed something suspicious in the grain pile.
Memory exists not only in humans and animals but also in some physical objects and machines. Computers, for example, contain devices for storing data for later use. It is interesting to compare the memory storage capacity(容量) of a computer with that of a human being. The instant access memory of a large computer may hold up to 100,000 “words”—strings of alphabetic or numerical characters—ready for instant use. An average U.S. teenager probably recognizes the meaning of about 1000,000 words of English. However, this is but a part of the total amount of information that the teenager has stored. Consider, for example, the number of faces and places that the teenager can recognize on sight.
The use of words is the basis of the advanced problem solving intelligence of human beings. A large part of a person’s memory is in terms of words and combinations of words. But while language greatly expands the number and the kind of things a person can remember, it also requires a huge memory capacity. It may well be this capacity that distinguishes humans, setting them apart from other animals.Which of the following is true about memory?
| A．It helps us perceive things happening around us every day. |
| B．It is based on the decisions we made in the past. |
| C．It is rooted in our past habits and skills. |
| D．It connects our past experiences with the present. |
According to the passage, memory is helpful in one’s life in the following aspects EXCEPT that________________.
| A．it involves a change in one’s behavior |
| B．it keeps information for later use |
| C．it warns people not to do things repeatedly |
| D．it enables one to remember events that happened in the past |
What is the major characteristic of man’s memory capacity according to the author?
| A．It can be expanded by language. |
| B．It can remember all the combined words. |
| C．It may keep all the information in the past. |
| D．It may change what has been stored in it. |
Human beings make themselves different from other animals by________.
| A．having the ability to perceive danger |
| B．having a far greater memory capacity |
| C．having the ability to recognize faces and places on sight |
| D．having the ability to draw on past experiences |