单项选择题

A．800 years.
B．400 years.
C．550 years.
D．2,000 years.
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单项选择题
The reason why people might not be able to stay alive in a world without emotion is that ________.
A．they would not be able to tell the texture of objects
B．they would not know what was beneficial and what was harmful to them
C．they would not be happy with a life without love
D．they would do things that hurt each other’’s feelings
问答题
Newton seemed puzzled about not knowing______________.
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