单项选择题

According to the author, IPCC pictures put forward by Houghton shows ______.

A．effects of global warming
B．causes of global warming
C．examples of human damage to the environment
D．instances of natural disasters threatening human existence
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单项选择题
According to the passage, the vast majority of crimes ______.
A．are very likely solved by routine investigation
B．can not be solved simply through routine investigation
C．are unlikely to be cleared up at all
D．can not be solved because the defendants are unknown
单项选择题
According to Morgan, the salving of the overwhelming majority of crimes depends largely on ______.
A．the police's collecting evidences on the site of the crime
B．experienced police investigators' rating information in the crime files
C．information collected by the police in police interviews
D．information provided by the public who discovered the crime
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