c) Due to the dense woods and the field of vision obstructed by the snow d) Owing to the bigger risk of getting stuck in the mud
18. The snow-laden trees that the writer hit....................
a) had left the auto in ruins by the time they reached the highway
b) were so small that they did not cause much damage to the Plymouth
c) show how inexperienced a driver the writer was
d) turned the car into a pile of moving snow It is assumed that each spot on the skin has a specialised sensory ending which produces
sensations of cold, heat, pain, or touch. An examination of a bit of skin under a high-powered
microscope indicates that the matter is not so simple. The deep layers of the skin contain a large
number of sensory fibres of various dimension. Each fibre branches like a tree, and its branches
interweave with the branches of many neighbouring fibres. At the end of each branch is a
sensory receptor characteristic of that particular fibre. These receptors range in complexity from
highly organised structures of considerable size to "bare"; undifferentiated fibrils with no more
than a tiny knob at the tip. The intermingling of the fibre branches and the great number of
different endings at any one skin spot suggest how difficult it would be to stimulate one ending
or one fibre selectively. An ordinary stimulus, whether a pinprick, a light touch or pressure,
invariably activates a large number of different sensory fibres. The evidence is inescapable that
the sensations we describe as "touch" and "pain" must be derived from the concurrent activation
of many different sensory fibres of various sizes and distribution.
19. An examination of a tiny spot of the skin with a microscope of strong magnifying power
shows....................
a) each spot on the skin has a differentiated sensory ending that produces feelings of cold, heat
etc...
