单选题：According to scientists, people sneeze because________

  • 题目分类：公共英语三级
  • 题目类型：单选题
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题目内容：
According to scientists, people sneeze because________ A．they are ill
B．to sneeze is human nature
C．they do not need any conscious help
D．there are unwanted things in their noses
参考答案：
答案解析：

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