Reading passages

50. It is explained in the passage that the 
efficiency of the computer_______
A)
depend on the speed with which the data are 
collected 
B)
will soon make it possible for man to be 
served by robots 
C)
can best be appreciated in the decision-
making positions 
D)
is the result of its being concentrated on one 
task at a time 
E) depends on sophisticated electro-mechanical 
interactions 
51. The author feels that Computers 
.
A)
have contributed immensely to the
improvement of living standards 
B)
are becoming unaffordable as they get more 
developed 
C)
have been unnecessarily overrated 
D)
will be a major force behind all future 
progress 
E) are capable of doing all the tasks the human 
brain performs even more efficiently 
Most substances, either artificial 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. However, some other matters 
cannot be controlled in this way because they are 
released, not in industrial waste streams, but through 
the use or disposal 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 accurate way to deal with them is 
through controls over their supply, use and disposal 
52. 
According to the passage, the threat of some 
certain 
substances 
to 
the 
environment
 
_________.
A)
is for less than that to man 
B)
could be reduced by enforcing emission limits 
and environmental controls 
C)
has been unnecessarily over emphasized 
D)
has to date been completely ignored 
E) can be eliminated by the use of industrial waste 
streams 
53.