单选题 What's the main idea of this passage?

A、 People greet each other by shaking hands in America.
B、 Every country has their own gestures.
C、 Learning a culture's body language is very important and. necessary.
D、 It is all right to point at things but not at people with the hand and index finger.

【正确答案】 C

【答案解析】[解析] 主旨大意题。文章的首段就给出了本文的主旨。It is important to know the body language of every country or we may be misunderstood．了解每个国家的身体语言是非常重要的，否则我们很有可能会遭到误解。故答案为[c]。