单项选择题
According to the passage, we can infer that underground pollutants ______.
A.can be carried by water flow.
B.may not reach the surface.
C.especially dangerous when they exist.
D.form spreading plumes of contaminants.
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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
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单项选择题
Air, water and food is ______ to good health.
A.vital
B.convenient
C.important
D.sufficient
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