单项选择题

The main idea of this passage is ______.

A．studies on the cause of cancer
B．controversial view-points in the cause of cancer
C．the relationship between electricity and cancer
D．different ideas about the effect of electricity on caner

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单项选择题

The view-point of the EPA is ______.

A．there is casual link between electricity and cancer
B．electricity really affects cancer
C．controversial
D．low frequency electromagnetic field is a possible cause of cancer

单项选择题

The author is mainly concerned with ______.

A．defining the Modernist attitude toward art
B．explaining how photography emerged as a fine art
C．explaining the attitude of serious contemporary photographers toward photography as art and placing those attitudes in their historical context
D．defining the various approaches that serious contemporary photographers take toward their art and assessing the value of each of those approaches