单项选择题

The best title for this passage is ______.

A．About Wastes
B．Hazardous Wastes
C．Results of Hazardous Wastes
D．Effects of Hazardous Wastes
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单项选择题
In planning an exercise, you’d better think, the following factors except ______.
A．age
B．one's personal objectives
C．existing health condition
D．sex
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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