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Transportation use a to Be
Much Slower than It Is Now{{/B}} For many years in tile desert, camels used to be the only form of transportation. Before the {{U}} (51) {{/U}}of modern trains, camel trains used to carry al! the goods for trading between Central Africa and Europe. Traders sometimes{{U}} (52) {{/U}}to put together camel trains with 10,000 to 15,000 animals. Each animal often carried{{U}} (53) {{/U}}400 pounds and it could travel twenty miles a day. This form of transportation was so important{{U}} (54) {{/U}}camels were called the "ship of the desert". Now modern trains travel across the desert in a very{{U}} (55) {{/U}}time. One engine can pull as much weight as 135,000{{U}} (56) A. camels B. ships C. pounds D. cars 更多"阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的"的相关试题: [单项选择] 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
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