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(微分公式)d()=2dx

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A language which is widely adopted for communication between two speakers whose native languages are different from each other is called____?

A. a mother tongue
B. a second language
C. a lingua franca
D. an international language

How many working languages of the United Nations are there ?

A. 2
B. 3
C. 4
D. 5

Over __% mails are written by English and about __% broadcast is spread in Englsh.

A. 60.70
B. 70,60
C. 60,60
D. 70.70

What does WTO stand for according to the video ?

A. World Trade Organization
B. World Transport Organization
C. World Translation Organization
D. World Tourism Organization

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