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  3. Men have traveled ever since they first appeared on the earth. In primitive times they did not travel for pleasure but to【C1

Men have traveled ever since they first appeared on the earth. In primitive times they did not travel for pleasure but to【C1

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问题     Men have traveled ever since they first appeared on the earth.
    In primitive times they did not travel for pleasure but to【C1】______new places where their herds could feed, or to escape from【C2】______neighbors, or to find more【C3】______climates. They traveled on foot. Their【C4】______were long, tiring, and often dangerous. They protected themselves with simple【C5】______such as wooden sticks or stone clubs, and by lighting fires at night and, 【C6】______all, by keeping together.
    Being intelligent and creative, they soon【C7】______easier ways of traveling. They【C8】______on the backs of their domesticated animals; they hollowed out tree【C9】______and, by using bits of wood as paddles(桨), were able to travel across water.
    Later they traveled, not for necessity, but【C10】______the joy and excitement of seeing and experiencing new things. This is still the main【C11】______why we travel today. Traveling, of course, has now become a【C12】______organized business. There are cars and splendid roads, express trains, huge ships and jet airplanes, all of【C13】______provide us【C14】______comforts and security. This sounds wonderful.【C15】______there are difficulties. If you want to go【C16】______, you need a passport and a visa, tickets, luggage, and a hundred and one【C17】______things. If you lose any of them, your journey may be【C18】______. Scientists have invented machines that can explore【C19】______space. Eventually there will be cheap day excursions to the moon and honeymoon on Venus. People will be able to fly from one planet to another in nasty(令人极不愉快的 ) little arrow-shaped tubes. I say "people" because I have no【C20】______of being one of them.
【C7】
选项 A、recovered
B、discovered
C、created
D、improved
答案B
解析
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