（B）
Unlike the other senses，which are located only in your head，your sense oftouch is all overyour body．Throughout your life，youreceive an endless flowof information about the worldand yourself fromyour sense of touch．It tells you if something is hot or cold，hard or soft．It sends messages of pain，such as a headache or sore throat，if there is a problem．
There are thousands of tiny sensors all over your body．They are all linkedtogether．These sensors are also linked to yourspinal cord（脊髓）and your brain to make up yourcentral nervous system．Through this system，the various parts of your body can sendmessages to your brain．It is then thebrain's job to decide what it is you are actually feel-ing．All this happens in just a split second．
Not all parts of your body have the same amount of feeling．Areas that have the mostnerves，or sensors，have the GREatest amount of feeling．For instance，the tips of your fin-gers have more feeling than parts of your arm．
Some sensors get used to the feeling of an object after a period of time．When you firstput your shirt on in the morning，you can feel its pressure on your skin．However，some ofthe sensors stop responding during the day．
One feeling you cannot get used to is the feeling of pain．Pain is an important message，because it tells your brain that something harmful is happening to you．Your brain reacts bydoing something right away to protect you．
26．What are linked together to make up the central nervous system of our body？
A．Head，muscles and bones．B．The nerves，spinal cord and brain．
C．Sense of touch，sense of smell and sense of taste．
D．Heart，blood-vessels and brain．
27．One feeling a person can never getused to is ____ ．
A．softness B．pressure C．pain D．cold
28．Through the central nervous system，howfast can the various parts of our body send messages to our brain？
A．In two seconds．B．In one minute．
C．In less than one second．D．In two minutes．
29．Which of the following statements is NOT TRUE？
A．It is the brain's job to receive messages fromthe sensors on our body．
B．Some sensors get used to the feeling of an object after a period of time．
C．Our sense of touch is located all over our body，but the other senses are only in our head．
D．All parts of our body have the same amount of feeling．
30．What's the main idea of this passage？
A．The sense of touch is all over our body．
B．One cannot get used to the sense of pain．
C．Each sense is very important in ourdaily life．
D．Our body has the same amount of feeling．
参考答案：
D 26．B 27．C 28．C 29．D 30．A2006年10月23日
