短文填空：

        根据上下文和括号里的汉语提示，在下面短文的空白处写出正确的单词或短语，使短文意思完整。

         All over the world people enjoy sports. Sports help people to keep healthy, happy and to live longer.Many people like to 1________(观看)others play sport games. They buy tickets or turn on their TV set to watch the games. They often 2_________(感到)very very happy when “their” player or team wins.

         People play different games in winter and summer. Summer is 3________(有利于)swimming. And in winter people often go skating.

         Some sports are very interesting and people everywhere are in them. 4________(例如), football is very popular. In China most people, men, women, boys and girls like to watch football games. They often 5________(谈论)it. Some people often 6__________(踢足球). Running and jumping began 7_________(很久，很久以前). But basketball and volleyball are rather new. People began to play them 8_______(不久以前). And people are starting new sports or games all the time. Water skiing is one of the 9_________(最新的).

        People from 10_________(不同的国家)may not be able to understand each other, but after a game they often become friends.

如图所示，神经纤维MB段距离长于MC段，在M处给以电刺激，在B，C处用电流计测其电位变化，电流计指针（）

A.不动

B.向左摆

C.向右摆

D.发生两次方向相反的摆动