单项选择题

Most middle-aged people get fatter, mainly because ______.

A．they made dietary changes when they grow old
B．of their sedentary living
C．they don't exercise regularly
D．the chemical activity in their body that uses the food to produce energy slows down
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单项选择题
What can be inferred from the passage
A．The slower people lose weight, the less likely they are to achieve their goals.
B．People who are on diet merely lose muscle and water.
C．Regular exercises may reduce the chance of getting certain chronic diseases.
D．Physical activity use muscle tissue as its main source of energy.
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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