单项选择题

What does "we have been 'twiddling the knobs' for decades" mean

A．We have been changing the climate with thoughtless actions for decades.
B．We have been handling machines with poor skills for decades.
C．We have been following a misleading chapter about the earth for decades.
D．We have been mistaken in the belief in developing the agricultural infrastructure.
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单项选择题
According to Morgan, the solving 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
单项选择题
Which of the following is NOT true according to the passage
A．The climate in recorded human history has generally remained stable.
B．The climate from about 135,000 to 115,000 years ago was in a extremely cold state.
C．The human race has been lucky to have enjoyed the most favorable period of climate for them to build a socio-economic system.
D．The evidences scientists collected from the ice cores suggest that a civilization can not have arisen in the period from about 135,000 to 115,000.
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