d) man cannot manage to handle the computers well enough, as result of which computers cannot be supplied with the sufficiently accurate instructions.
20. Readers are still able to conclude the sentences here
a) although it is clear that we have some kind of sentence producing mechanism - that sentences are produced a new each time and not merely imitated.
b) although we can produce millions of sentences that we have never heard or uttered before.
c) although sentences are produced anew each time and not merely imitated.
d) although many of them have been produced for the first time.
21. That the man is able to construct numerous sentences
a) is due to the fact that language is productive.
b) is because even the best programmed computer still cannot consistently translate from, say Russian into English.
c) is because we are still unable to handle the vastly complex system of computers.
d) is because according to the calculations the brain used some of the known methods of computing language.
The cheetah, the only mammal in the world that can sprint at speeds faster than 70 miles per hour, is on rapid track to extinction. Two factors threaten its existence. The first is lack of genetic variation, which manifests itself in reproductive problems excessive infant mortality and vulnerability to disease. These seem to be exacerbated in captivity, where cheetahs are experiencing a precipitous decline in number. The second threat to the cheetah is loss of its natural habitat to agricultural expansion.
22. The cheetah is only the one mammal in the world that............. .
a) threatens the nature.
b) is in danger of extinction. 55
c) no other animals can reach its speed.
d). has a speed reaching more than 70 miles per hour.
23. The cheetah is face to face with extinction because ............. .
a) of its speed
b) they are experiencing a sudden decline in number
c) of reproductive problems
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