Read the article and select the best answer. Article: What if I took that big jump on my bike?What's the worst thing that could happen if I go out at midnight?Should try smoking?The teen years can play out like a choose-your-own-adventure novel. Teenagers must act on an endless parade of choices.Some choices.including smoking.Come with serious consequences.As a result, adolescents often find themselves trapped between their impulsive tendencies(-Just try it!)and their newfound ability to make well-informed and logical choices(-Wait, maybe that's not such a good idea!). So what makes the teenager's brain so complex? What drives adolescents-more than any other age group-to sometimes make rash or questionable decisions? If you have ever thought that the choices teenagers make are all about exploring and pushing limits, _ . Experts Experts believe that this tendency marks a necessary period in teen development.The process helps prepare teenagers to confront the world on their own. It is something all humans have evolved to experience-yes, teens everywhere go through this exploratory period.Nor is it unique to people:Even laboratory mice experience a similar stage during their development. For example,laboratory experiments show that young mice stay close by their mothers for safety. As mice grow.their behavior does too."When they reach puberty,they're like,'I'm gonna start checking out how this environment looks without my mom,...explains Beatriz Luna,of the University of Pittsburgh. As a developmental cognitive neuroscientist,Luna studies those changes that occur in the brain as children develop into adults.She and other researchers are showing how the teen experience can lead to powerful advantages later in life.Take mice again:Young mice that explore most tend to live longest----that is,unless a cat eats them,Luna adds. Question: What may the text discuss in the next part? Options: A: How call a teenager make right choices B: Why the parents shouldn't allow teenagers to smoke C: What has been discovered in the lab experiment. D: What really goes on in the teenage brain.
D

Read the article and select the best answer. Article: Why did the chicken cross the road? To get to the other side. Most people know this joke. But recently, some people have been much more worried about how the grizzly bear and mountain lion can cross the road. "Millions of animals die each year on U.S. roads," the Federal Highway Administration reports. In fact, only about 80 ocelots, an endangered wild cat, exist in the U.S. today. The main reason? Roadkill. "Eco-passages" may help animals cross the road without being hit by cars. They are paths both over and under roads. "These eco-passages can be extremely useful, so that wildlife can avoid road accidents," said Jodi Hilty of the Wildlife Protection Society. But do animals actually use the eco-passages? The answer is yes. Paul Beier of Northern Arizona University found foot marks left by mountain lions on an eco-passage that went under a highway. This showed that the lions used the passage. Builders of eco-passages try to make them look like a natural part of an area by planting trees on and around them. Animals seem to be catching on. Animals as different as salamanders and grizzly bears are using the bridges and underpasses. The next time you visit a park or drive through an area with a lot of wildlife, look around. You might see an animal overpass! Question: The writer uses the example of "ocelots" to show that _ . Options: A: wild animals have become more dangerous B: the driving condition has improved greatly C: an increasing number of animals are killed in road accidents D: the measure for protecting wildlife fails to work
C

Read the article and select the best answer. Article: When you have a question about something, where do you go? For many people the answer is simple. They go online to a search engine like Google or Yahoo. But what about people in rural or underdeveloped areas who may have no way to get on the Internet? Luckily, Rose Shuman, a business and international development consultant in California, has found a way for them. Her amazing solution is "Question Box". Question Box is a service that provides answers--free of charge--for people who cannot search the Internet directly. They might not be able to read, or they simply have no access. Question Box began two years ago in India.People use a metal call box with a pushtotalk button to connect to a live operator, as Rose Shuman explains, "You just push a button, a big green button, and that will connect you directly to our operators who are sitting in front of computers, and speak your language. And you can ask them any sort of question you want, and they'll look it up in English or in Hindi, or whatever the main language is, and translate the answer right back for you." The service is currently offered in two villages. The latest version of the box uses mobile phone technology and solar panels in case the electrical power fails. Rose Shuman says the aim was to make the box as easy as possible for users. "Rather than try to bring a lot of infrastructure to them and expect them to learn how to use the Internet, the idea was to make a technology that even Grandma could use, figuring that Grandma could probably walk up to a box and push a button," added Shuman. In April, Question Box expanded to Uganda.Forty community workers with mobile phones connect villagers to call center operators in Kampala.The community workers go around telling people about the service. They wear Tshirts that say "Ask Me." But Internet service in Uganda proved slow and undependable. So Question Box teamed up with a local technology company to store information on a local server. That way, the researchers in Kampala can quickly search the... Question: According to the passage, "Question Box" is a service intended to _ . Options: A: help improve the living standard of the people in poor areas B: promote the computer technology C: provide answers raised by the people who have no access to the Internet D: enrich the local people's life
C