单项选择题

The best title for this passage is ______.

A．Benefits of Exercise
B．Exercise and Disease
C．Physiology of Exercise
D．Exercise and Health
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单项选择题
We can infer from the passage about how much exercise is enough to improve general health, ______.
A．different people have nearly the same opinion
B．it is easy to reach a conclusion
C．researchers have made a conclusion
D．it is a time-consuming study
单项选择题
About the effect of hazardous wastes, which of the following statements is true
A．We can't feel hazardous wastes directly
B．Hazardous wastes connect with each other
C．Evaporation of toxic solvents from paints and cleaning agents is a common problem.
D．Hazardous wastes lie everywhere in the world
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