单选题：If headaches only occur at night, lack of fresh air is often

题目内容：

If headaches only occur at night, lack of fresh air is often the cause.（　　） A．start
B．begin
C．happen
D．visit

参考答案：

答案解析：

Which of the following statements is NOT true according to t

Which of the following statements is NOT true according to the passage?A．Parents

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