单项选择题
A.told
B.numbered
C.talked
D.listed
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单项选择题
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
Why did the professor put the food in a small box
A.To give the monkey a surprise.
B.To see how the monkey ate from a box.
C.To see how soon the monkey could find it.
D.To find out how the monkey would open the box.
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