题目

       Are your table manners much better when you are eating  at a friend’s home or in a restaurant than they are at your own home ?Probably so ,   45    you are aware that people judge you by your table manners .You take special pains when you are eating    46   .Have you ever stopped to realize how much less self-conscious you would be on such occasions if    47   table manners had become a habit for you ?You can make them a habit by   48    good table manners at home.       Good manners at mealtimes help you and those around you to feel  49     .This下图是神经元结构模式图，结合图示分析下列叙述正确的是（ ） A．图中1是神经元的胞体B．图中2、3、4是突起，它们共同组成神经纤维C．图中2是树突，可接受信息，3是轴突，可传出信息D．神经冲动的传导方向是4→3→2