How many different forms of communication are mentioned here

Câu hỏi :

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

A. 5

B. 7

C. 10

D. 11

* Đáp án

* Hướng dẫn giải

  Đáp án là C. Đó là: oral speech , letters, a wink, a nod, shaking, signal flags, morse code, and smoke signals, road maps and picture signs,

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