For a wrong word, underline the
wrong word and write the correct one in the blank provided at
the end of the line. For a missing word,
mark the position of the missing word with a "∧" sign and write the
word
you believe to be missing in the blank provided at
the end of the line. For an unnecessary word, cross out the
unnecessary word with a slash "—" and put the word in the
blank provided at the end of the line.
Where do pesticides fit into the picture of environmental disease
We have seen that they now pollute soil, water and food, that they have
the power to make our stream fishless and our gardens and woodlands silent
41 ______ and
birdless. Man, however much he may like to pretend the contrary, is part of
nature. Can he escape a pollution is now so thoroughly
42
______ distributed throughout our world We know that even
single exposures to these chemicals, if the amount is large enough, can lead
extremely severe poisoning. But this is not the major
43 ______ problem. The sudden illness or death of farmers,
farm workers, and others exposed to sufficient quantities of pesticides are
very sad and should not occur. 44 ______ For the
population as whole, we must be more concerned with the delayed
45 ______ effects of absorbing
small amounts of the pesticides that visibly pollute
46 ______ our world. Responsible public
health officials have pointed out that the biological affects of chemicals
are cumulative over long periods of time,
47 ______ but the danger to
individual may depend on the sum of the exposures
48 ______ received throughout his
lifetime. For these very reasons the danger is easily ignored. It is human
nature to shake off that may seem to us a
49 ______ threat of future disaster. "Men are
naturally most impressed by diseases which have obvious signs," says a wise
physician, Dr. Rene Dubos, "yet some of their worst enemies slowly approach
to them unnoticed."
50 ______