Reading passages

 
56. The cheetah is threatened by extinction 
because .
A)
of its speed 
B)
they are experiencing a sudden decline in 
number 
C)
of reproductive problems 
D) they live in captivity 
E) of lack of genetic differentiation and agricultural 
growth 
57. 
Reproductive problems illustrate .
A)
that cheetahs don't have a variation in their 
genetic structure 
B)
that the amount of infant mortality is 
excessive 
C)
cheetah is threatened by extinction 
D)
cheetah's vulnerability to disease 
E) loss of their natural habitat leads them to 
extinction 
When it was formed millions years ago the earth 
was a liquid. It is s having the process of cooling 
and many miles below the hard crust is s hot. 
However, in some places the heat is closer to the 
crust. These places 
i 
associated with volcanic 
activity or hot sulphur springs. Drilling deep ir the 
earth's crust we can reach rocks that are much 
warmer than those at t. surface. Pumping water 
down into contact with these rocks and extracting tl 
steam so produced is a source of energy that can be 
used to produi electricity. It is called geothermal 
energy. 
 
58. It is explained in the passage that under the 
hard surface of th earth, there________.
A)
exists a hot core which can be used as energy 
B)
is a hot liquid layer which has never been 
drilled 
C)
seems to be a great deal of volcanic activity 
which threatens life 
D)
could be a number of hot sulphur springs, the 
main cause o: volcanic activity. 
E) has never been sufficient heat to melt rocks 
 
59. According to the passage, gjgothermal energy
 
.
A)
can be produced both plentifully and cheaply 
B)
has been used by man for millions of years 
C)
is a bi-product of extensive volcanic activity 
D)
is obtained from the contact of water with the 
hot rocks below the earth's surface 
E) is recognised as the only form of energy that 
will never be used up