2. 外语
  3. Men have traveled ever【C1】______ they first appeared on the earth.【C2】______ primitive times they did not travel for pleasure b

Men have traveled ever【C1】______ they first appeared on the earth.【C2】______ primitive times they did not travel for pleasure b

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问题      Men have traveled ever【C1】______ they first appeared on the earth.【C2】______  primitive times they did not travel for pleasure but to find new places【C3】______  their herds could feed, or to escape【C4】______ hostile neighbours, or to find more favourable【C5】______  . They traveled on foot. Their journeys were long,【C6】______ , and often dangerous. They protected【C7】______ with simple weapons, such as sticks or stone clubs, and by lightning fires at night and, above【C8】______  , by keeping together.
     【C9】______ intelligent and creative, they soon discovered easier ways of traveling. They【C10】______ on the backs of their domesticated animals; they hollowed out tree trunks and, by using bits of wood as paddles, were able to travel【C11】______ water.
     Later they traveled, not for necessity, 【C12】______ for the joy and excitement of seeing and experiencing new things. This is still the main reason【C13】______  we travel today. Traveling, of course, has now become a  【C14】______  organized business. There are cars and splendid roads,【C15】______ trains, huge ships and jet airliners, all of【C16】______  provide us【C17】______ comforts and security. This sounds wonderful. But there are difficulties. If you want to go【C18】______ , you need a passport and a visa, tickets, luggage, and a hundred and【C19】______  other things. If you lose any of them, your journey may be 【C20】______ .
【C13】
选项 A、because
B、how
C、as
D、why
答案D
解析 根据定语从句的关系副词选择规则，正确答案是D。
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