The skin which covers the tips of the fingers and thumbs is crossed by numerous ridges (隆起) arranged in different patterns. These patterns are permanent from birth and remain exactly the same throughout a person's life, even when the skin becomes wrinkled and cracked as a result of old age. Such patterns are never passed on from parents to children, and no one in the world has the same patterns as anyone else. Even identical twins have different sets of fingerprints. As a result, fingerprints offer a most useful and foolproof way of identifying people. Any ridged part of the hand and the foot may be used as a means of identification, but finger impressions are usually preferred since they can be taken easily and quickly.
Fingerprints are classified in the ways: by general shapes and contours(轮廓), by the finger positions of the pattern-types, and by size (often measured by counting the ridges in the loops). Every set of fingerprints has different “ridge characteristics” (i. e. the print of each separate finger is different from that of all the other fingers), which belong to one of four basic groups: arches, loops, whorls and composites. All fingerprints can then be divided into 1, 024 groups. By using details in the patterns above, these 1, 024 groups can be further divided into thousands of smaller groups, thus making it possible to find a particular set of fingerprints in a few minutes.
【小题1】According to this passage, the true statement about human fingerprints is that ____.

There are many international organizations which work to save and protect endangered species and natural environment. If you would like more information about any of the organizations listed blow, you can write to the addresses given.

Baby girls make their way directly for dolls as soon as they can crawl, while boys will head for the toy cars, a study has shown. The findings, the first to show differences in very young babies, suggest there is a biological（生物学的） basis(基础) to their preferences（偏爱）.
Psychologists(心理学家) Dr. Brenda Todd from City University London carried out an experiment involving 90 infants(婴儿) aged nine months to 36 months. The babies were allowed to choose from seven toys. Some were stereotypically boys' toys - a car, a digger, a ball and a blue teddy.  The rest were girls’ toys: a pink teddy, a doll and a cooking set. They were placed a meter away from the toys, and could pick whichever toy they liked. Their choice and the amount of time they spent playing with each toy were recorded.
Of the youngest children (nine to 14 months), girls spent significantly(明显的) longer playing with the doll than boys, and boys spent much more time with the car and ball than the girls did. Among the two-and three-year-olds, girls spent 50 percent of the time playing with the doll while only two boys briefly(简单地) touched it. The boys spent almost 90 percent of their time playing with cars, which the girls barely(几乎不) touched. There was no link between the parents’ view on which toys were more appropriate for boys or girls, and the children’s choice.
Dr Brenda Todd said: “Children of this age are already exposed (暴露)to much socialization(社会化). Boys may be given ‘toys that go’ while girls get toys they can care for, which may help shape their preference. But these findings agree with the former idea that children show natural interests in particular kinds of toys. There could be a biological basis for their choices. Males through evolution have been adapted to prefer moving objects, probably through hunting instincts（本能）, while girls prefer warmer colours such as pink, the colour of a newborn baby.”
【小题1】Baby boys and girls have different toy preferences probably because__________.    

In June 2008,Benita Grist was driving in her hometown of Mississauga as a passenger in the car ahead threw a paper cup out of the window.When Grist horned to express her displeasure, the passenger responded by throwing out a bag.
Instead of annoyed, she decided to do something about it.She organized a one woman litter?awareness campaign.She started small,chatting with her neighbors about litter—and asking them to be more conscious of any tendencies they might have to litter.Soon,she noticed local families, kids and all—picking up litter around their homes.”I thought,that’s all it took—for me to open my mouth?” she says.”So I decided to knock on more doors.”
And she didn’t stop there.She approached people on the street,in malls,even in the waiting room before getting an X ray. Grist often started her appeal with something such as,”I hope you don’t think I’m crazy,but...” Yet she was buoyed by the positive response—so much so that in August 2008, she began to contact officials in various levels of government, companies and other institutions in an effort to reach a wider audience.
Through a local Mac’s Convenience Store,Grist managed to contact the company that produces content displayed on their in store monitors.That led to a public service announcement about litter that ran in almost 600 Mac’s stores in Ontario from November 2008 to June 2009. Grist continues to explore every opportunity she has to get the message out.Her grassroots campaign may be different,but she has begun to open people’s eyes about the problem of litter.And thanks to her efforts,in Mississauga,at least,they have begun to do just that.
【小题1】How did Benita Grist start her campaign?

Technology is making life easier for some dairy farmers. They use robotic systems to milk their cows. Cows are trained to follow a series of paths that lead to milking stations. Only one cow at a time can enter a station.
Once inside, the cow is rewarded with food. As the cow eats, a robotic arm cleans and connects the animal to the milking machine. A few minutes later, milking is complete. The gate is opened, the cow is released and the next cow enters.
The robotic systems are designed to operate 24 hours a day. The cows get to decide when they want to be milked. Cows are milked an average of about three times a day. Some are milked four to six times a day.
The cows wear collars around their necks that identify them to the system. A computer keeps records on their eating and milking. A cow is released from the station if the computer decides it should not be milked.
The automated system also measures the temperature and color of freshly produced milk. Milk is thrown away if it does not pass the tests.
Professor Plaut believes the systems will appeal especially to the next generation of farmers. She means young people who are more interested in technology and less interested in working all the time on the farm. Still, she says the price of robotic milking systems will continue to limit their use.
Doug and Tina Suhr have more than 100 cows on their family farm. Last year it became the fourth farm in southeast Minnesota to get a robotic milking system. A recent story in a local agricultural newspaper said the first robot cost 175 000 dollars. The second cost 150 000.
Doug told AgriNews that wages that would have been paid for one employee in five years will pay for one robot. He says the increase in milk production reaches a high of more than six kilograms per cow per day.
【小题1】From the first paragraph, we can infer________.