解析：选A。细节理解题。由倒数第三段的叙述“The 20th century saw cars become more and more”可知答案选A项。
4．The underlined phrase “take off” in the last paragraph means ________.
A．a plane rising into the air                    B．develop very fast
C．remove hats and clothes                      D．bring down the prices
解析：选B。词义猜测题。该词组的前一句介绍：“中国的旅行社是在1949年建立的，但旅游业直到1978年才……”，因此推断该词意为“兴旺，兴起”，故选B项。
B
Once a year, the National Geographic Society honors a group of scientists, activists, wildlife experts and artists for their work as explorers and thinkers. Honorees receive a ten­thousand­dollar award to help them continue their research and projects. Here are some of last year's fourteen Emerging Explorers.
Biologist Aparajita Datta works in the forests of India's Arunachal Pradesh area. She has been studying the Namdapha National Park for more than ten years. She says the area has five hundred kinds of mammals(哺乳动物)and more than one thousand different kinds of plants. The Lisu tribal (部落的) group also lives in this area. Aparajita Datta helped  create a program  to reduce hunting and plant destruction (破坏). It helps the Lisu grow food, open schools and earn money in ways that do not harm the environment.
Zoltan Takacs has traveled all over the world studying snakes and the poisons they produce. Some poisons these animals use to kill contain valuable chemicals that have been made into medicines. But studying these poisons and how they might be useful in fighting disease is extremely hard and slow work. Mr Takacs works with a team of researchers at the University of Chicago. They have created a technology that helps organize information about snake poisons so it will be easier to study their possible use as cures.
Ken Banks was working on a project in Africa. He saw a need for a kind of technology that would  permit  people in rural areas to communicate to groups without the use of the Internet. He knew that many organizations in rural areas did not have an Internet connection. He knew they needed a communication method that was easy and low­cost. So he developed a computer program that permits people to send information to groups using text messages on wireless telephones. He made his FrontlineSMS program free so that anyone can use it.

语篇解读：美国国家地理学会每年会给一些科学家、积极分子、野生动物专家和艺术家颁发荣誉，让我们看看2010年的一些获得此殊荣的杰出者吧。

5．From Paragraph 1 we know that ________.
A．artists usually are not given the honor
B．most of the receivers of the honor are famous scientists
C．every year only fourteen people will be given the honor
D．honorees will be given a sum of money to encourage them
解析：选D。细节理解题。根据第一段的 “Honorees receive a ten­thousand­dollar award to help them continue their research and projects.” 可知会有金钱上的奖励。
6．What is implied (暗示)in Paragraph 2?
A．Aparajita Datta opens schools to earn money.
B．The Lisu tribal group no longer hunts for food.
C．India's Arunachal Pradesh area is rich in natural species.
D．Mammals in India's Arunachal Pradesh area are in great danger.
解析：选C。推理判断题。根据第二段的 “She says the area has five hundred kinds of mammals (哺乳动物) and more than one thousand different kinds of plants.” 可推断那里物种丰富。
7．What does Zoltan Takacs want to do?
A．To protect snakes from their own poisons.
B．To prevent some snakes from dying out.
C．To make money out of snake poisons.
D．To make good use of snake poisons.
解析：选D。细节理解题。根据第三段的内容，可知 Zoltan Takacs 想将蛇毒转化成治疗疾病的药物，故选D项。
8．We can infer that Ken Banks ________.
A．made the Internet popular in poor areas
B．didn't try to make money out of his program
C．spent little money on the FrontlineSMS program
D．made wireless telephones more expensive in poor areas
解析：选B。推理判断题。根据末段的 He made his FrontlineSMS program free so that anyone can use it. 可知这个项目是免费的，故可推断 Ken Banks 并没想从中牟利。

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