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
单项选择题
In the United States, people usually spend about 80-90% of our time inside buildings.
A．Y
B．N
C．NG
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