单项选择题

What does the word "actions" (Line 2, Para. 5) refer to

A．Various crimes mentioned in the above paragraphs.
B．Suicides and admissions to mental hospitals.
C．Dynamic intellectual activities such as good performances in exams.
D．Violent attacks such as rape and murder.
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单项选择题
In Paragraph 4, why is there an exclamation point (!) after the last sentence
A．Because the author is surprised that so many people marry in summer.
B．Because the author is surprised that the marriage peak occurs in the same month as the suicides and mental hospital peak.
C．Because the author doesn't understand why the peak for suicides and marriage is in the same month.
D．Because this is the focus of the author's research which he wants to call our attention to.
单项选择题
It can be inferred from the passage that _________.
A．cold weather and high humidity cause more crimes
B．dogs are more likely to bite us in May
C．Professor Huntington is an expert in various cycles
D．the crime pattern has changed a lot over a long period of years
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