2. 外语
  3. Thousands of years ago, traveling was very hard. There were no roads and no cars. People traveled on rivers and lakes. They used

Thousands of years ago, traveling was very hard. There were no roads and no cars. People traveled on rivers and lakes. They used

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问题    Thousands of years ago, traveling was very hard. There were no roads and no cars. People traveled on rivers and lakes. They used logs, either one at a time, or tied together.
   People then began to use animals to pull very heavy loads. Some people put
选项 A、people traveled on lakes thousands of years ago
B、people used logs thousands of years ago
C、traveling was hard thousands of years ago
D、there were no roads and cars thousands of years ago
答案C
解析 读完第一段，可知第一句话即是这段的主题句，概括了这段的大意，其他三句是对第一句话的解释。
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