单项选择题

What is "proxy measurement" in Paragraph 1 likely to refer to

A．Studying the characteristics of glaciers.
B．Measuring the growth signs of aquatic organism.
C．Taking advantage of previous pictures.
D．Using clues left from the past.

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单项选择题

Which statement is NOT true concerning the controversy about global warming

A．The new report from NRC is motivated by the controversy over Michael Mann's claim.
B．Those who doubt global warming consider that warming is a natural phenomenon.
C．Those suspicious of global warming take an inconsistent stance on the issue.
D．The argument ends in the defeat of global-warning-doubters.

单项选择题

What is the author's attitude towards global warming theory

A．Negative.
B．Indifferent.
C．Favorable.
D．Neutral.