单项选择题

Questions 14-16 are based on the following passage. You now have 15 seconds to read Questions 14-16.
How did the professor watch the monkey

A．By waiting outside the door.
B．By waiting inside the door.
C．By kneeling down at the door.
D．By putting it in a small box.

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单项选择题

Questions 14-16 are based on the following passage. You now have 15 seconds to read Questions 14-16. How did the professor watch the monkey 您的浏览器不支持 audio 元素。