题目内容：
In Paragraph 1, what point does the author make about the evidence for the tiredness the-ory of yawning?
A．There is no scientific evidence linking yawning with tiredness. B．The evidence is wide-ranging because it covers multiple age-groups.
C．The evidence is reliable because it was collected over a long period of time.
D．The evidence is questionable because the yawning patterns of children and adults should be different.
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答案解析：