单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
What did Edwards Land invent

A．A new kind of film.
B．An automatic printer.
C．A cheap device of developing film at home.
D．An "instant" camera that develops its own film.

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单项选择题

单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. What did Edwards Land invent 您的浏览器不支持 audio 元素。