填空题.Unlike the other four senses, the sense organs for touch are distributed all over the body. Your other senses respond only to one type of stimulus (刺激) while touch is 21 to both temperature and pain. In fact, it is perhaps easiest to think of touch as a 22 of senses of which several have special end organs or nerve endings situated in your skin, muscles and elsewhere which respond to a variety of stimulus and convey their impressions to the brain. Your sense of touch enables you to do many things. With it you can feel a touch or stroke; 23 without looking the size and shape of objects; judge the heaviness of objects; tell whether something is hard or soft, hot or cold and whether or not it causes pain. Touch also gives you a sense of locality(地点), which means you can tell, without having to look, the 24 of any part of your body. Touch sometimes acts as your body's 25 warning system: the sensations of temperature and pain that your body is in danger before you are aware of any danger and your body will react immediately to 26 itself before it is seriously hurt or damaged. Touch can also help us to express a 27 range of emotions we might not be able to convey in any other way. In many ways our sense of touch is the senses in which we place(寄予) the most 28 as sometimes it is not until we can 29 touch something that we are convinced of its existence. For a baby this form of communication is particularly 30 because touching lets him know that someone is there and loves him. A. protect B. indifferent C. position D. early E. usually F. faith G. actually H. heat I. important J. group K. sensitive L. late M. wide N. make O. estimate