8. Nobody but two students        left in the classroom.

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  Have you ever thought, "I wish I could take a year off and just travel around the world?" Well,three lucky American teenagers were able to do just that. The teenagers―two males and one female―got an all-expenses-paid hike to five continents.

  This trip didn't include any fivestar hotels or shopping fun. 18-year-old Jamie Fiel from Keller,Texas,17-year-old Arsen Ewing from Canyon,California,and 16-year-old Tyler Robinson from Lincoln,Massachusetts,didn't expect fancy treatment. They signed up for the experience of a lifetime,which included hard work and often uncomfortable accommodations,and they may encounter with some of nature's most dangerous animals and environments.

  Jamie,Arsen,and Tyler were among hundreds of high school kids nominated by their science teachers to take this trip. Earthwatch Institute sponsored (贊助) this adventure. Each year,Earthwatch Institute employs thousands of volunteers worldwide to help with scientific research projects.

  The group went all around the world to get a close look at the most pressing environmental issues of our time. Their assignments were as varied as their loca?tions,and included measuring and attending pink flamingos in Kenya's Great Rift Valley,and tracking giant sea turtles in Costa Rica.

  As they worked with the scientists of Earthwatch Institute,Jamie,Arsen,and Tyler began to understand that we are at a critical moment in the life of our planet. Time for change is running out. As the teenagers went from country to country and witnessed different environmental dangers and challenges,they understood that so?lutions to important environmental issues start with the power of one person's ac?tions. They realized that each of them can make a difference.

1. These teenagers went on the journey around the world      .

   A. to experience the most serious environmental problems on the earth

   B. to bring the kindness of America to the other parts of the world

   C. to go sightseeing around the world

   D. to call on more teenagers to join Earthwatch Institute

2. Which is TRUE about their journey?

   A. They had to pay for their journey on their own expense.

   B. They often had to move from one hotel to another.

   C. They had to take great pains to collect environmental information.

   D. They received a warm welcome every time they arrived at a new place.

3. It can be inferred that Earthwatch Institute could be      .

   A. an international university that takes in students from all over the world

   B. a TV station that makes programmes on the beautiful scenery of the earth

   C. a travel agency that organizes adventure trips especially for school children

   D. an organization that brings science to life for people concerned about the earth's environment

4. The underlined word "encounter" means"       ".

   A. agree   B. meet   C. begin   D. trade

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1. Two thirds of this apple are bad.

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5. I was born       a rainy morning.

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3. The paper for books and newspapers        made of wood.

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3. The first man        (set) foot on the moon was Armstrong.

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1. It's said that the long bridge        in two months.

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5. 盡管老師詳細(xì)地講解了這個(gè)問題，但他還是不理解。

Although the teacher explained the problem      ,he still failed to understand.

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5. The meeting is        great importance to us. We can't miss it.

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