单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Playing a piano.
B．Making a photocopy.
C．Typing.
D．Taking a picture.

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All of the five vehicles most likely to be developed will be launched from the air.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。