SORU: aşağıdaki parçaya göre cevaplayınız
The author points out that the danger posed to
man by many substances ____ .
Many substances, whether man-made or natural, can
cause harm to man or the environment. Some of these
reach the environment in waste streams; however,
emission limits and environmental quality standards
can, in some instances, reduce the amounts released.
But some other substances cannot be controlled in
this way because they are released, not in industrial
waste streams, but through the use or disposal of
products which contain them. In many cases these
substances pose little or no threat if the product
containing them is used and disposed of properly. The
right way to deal with them is usually through controls
over their supply, use and disposal.