单项选择题

Which of the following would be the best title for the passage

A．Eating Without Gaining.
B．Exercise--An Effective Weight-loss Tool.
C．Metabolic Changes in Human Body.
D．Ways of Weight Control.
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单项选择题
According to the passage, which of the following is TRUE of the last hundred years
A．Fossil fuels were burned for the first time.
B．The average temperature at the Earth's surface has become 2℃ cooler.
C．The amount of carbon dioxide in the atmosphere has increased measurably.
D．The amount of farmland worldwide has doubled.
单项选择题
Which of the following best describes the author's attitude toward the increasing amount of carbon dioxide in the atmosphere and its consequences
A．Objective yet concerned.
B．Angry yet resigned.
C．Completely detached.
D．Incredulous.
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