四六级考试

【单选题】 One of the reasons why men invented certain sounds to express thoughts and actions was that they could ______.
A．agree with certain signs
B．write them down
C．make themselves understand each other
D．combine them

网考网参考答案：C
网考网解析：
[解析] 细节推理题。文章第一段说“人们发明了那些声音，因此他们能够互相交流”，即是他们可以互相理解对方的意思。 查看试题解析出处>>