Nearly everyone knows that humans and most animals possess t

Nearly everyone knows that humans and most animals possess the live senses of fight,heating,touch,smell,and taste.This is how they learn about the environment around them.Yet modem biologists have recognized that besides these five,a human or animal body has other senses-perhaps up to fifteen-that signal the brain concerning body's condition and needs.
Over the years scholars and scientists have classified the senses in different ways.We owe
the idea that there are five senses to the senses in Greek philosopher Aristotle.Today's scientists
generally group the senses into two kinds,external and internal.
Together the external and internal senses provide complete data for the body.The external ones include sight,heating,taste,and smell.They relay information about what happens outside the body.What we call touch is included under the somatic senses,which are both internal and external.The somatic senses let us feel not only pressure,heat,cold,and pain from external sources but also
hunger,thirst,fatigue,balance,and muscle tension from within the body.
Both external and internal senses depend on the nervous system.Both operate in much the same way.Every sense has special cells receptors,which are connected to nerve cells.Receptors for the external senses are localized in a few areas such as the retina of the eye for sight and the tongue for taste.Internal sense receptors are found in muscles and various organs,such as the heart and
stomach.When stimulated,a receptor sends nerve impulses to the brain.This causes a response.
The senses give us both warning signals and pleasure.If a fire begins at night in a bed room,
one's sense organs send messages to the brain.They report the smell and heat of the fire to the
brain so that it can sense the danger.Our senses of smell and taste help us detect whether foods
are beneficial or harmful.Hunger pangs informs us that it is mealtime,and the pleasurable
sensation of a full stomach let us know that we have had enough.
1.It can be inferred from the passage that _________.
A.we have fifteen sensesB.there are fifteen senses signaling the brainC.nobody knows how many senses we haveD.humans and most animals have more than five senses
2.The idea that there are five senses was proposed by _________.
A.ancient scientists B.AristotleC.today's scientists D.everyone
3.The word "somatic" is closest in meaning to" ________ ".
A.externalB.of the body C.internalD.within the body
4.Both internal-sense and external-sense receptors ________.
A.have their own systems B.are connected togetherC.send information to the brain D.are found in organs
5.A person knows about the quality of foods because he has ________.
A.a full stomach B.the pleasurable sensation C.a special feeling D.senses of smell and taste

C
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