Reading passages

The author assumes that the danger posed
to man by some substances________.
A)
is even greater than generally admitted 
B)
is unrelated to environmental pollution 
C)
continues to grow despite constant control of 
disposal systems 
D)
is solely due to the use of industrial waste 
streams 
E) arises from their misuse and wrong disposal 
54. The passage is concerned with the question 
of .
A)
how the harmful effects of certain substances 
can be kept under control 
B)
why industrial waste streams have led to so 
much pollution 
C)
what measures are to be taken against the 
supply of dangerous substances 
D)
if man-made substances and natural ones 
cause pollution 
E) who is responsible for taking the required 

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169 
precautions 
The cheetah, the only mammal in the world that can 
sprint at spee faster than 70 miles per hour, is on 
rapid track to extinction. Two factc threaten its 
existence. The first is lack of genetic variation, 
which manife; itself in reproductive problems 
excessive infant mortality and vulnerability disease. 
These seem to be exacerbated in captivity, where 
cheetahs 
i 
experiencing a precipitous decline in 
number. The second threat to t cheetah is loss of its 
natural habitat to agricultural expansion. 
55. 
The cheetah is the only mammal in the world 
that 
.
A)
threatens the nature 
B)
is in danger of extinction 
C)
no other animals can reach its speed 
D). has a speed reaching more than 70 miles per 
hour 
E) is thought to give harm to agricultural 
expansion