The compass was invented in China， but the computer was not. 罗盘是在中国发明的，但计算机不是。

a(n )侧重于指类别中任何一个的特点。如：
A tiger is a type of very large fierce wild cat.
老虎是个子很大而凶猛的野猫类动物。

不用冠词的复数名词侧重指类别中的许多个体。如：
Children usually start walking at around one year old.
小孩儿一般一岁左右开始走路。
Do you like horses? 你喜欢马吗？
(不能说Do you like a horse?)

在类指时如何使用冠词要根据所要表达内容的具体情况而定。
The tiger is in danger of becoming extinct.
虎有灭绝的危险。
(不能说A tiger is in danger of becoming extinct.濒临灭绝指的是整个虎类，而不是任何一只老虎都面临灭绝的危险)

13.   It is often said that _____ teachers have _____ very simple life.
 A. / , /   B. / ,  a    C. the , /   D. the , a

14.   ______ are very popular with people all over the world, but do you know who was it that invented ______ telephone?
A. The telephone; 不填         B. Telephone; a 
C. The telephones; the           D. Telephones; the

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