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.
【C11】

选项 A、cause
B、reason
C、goal
D、purpose

答案B

解析
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