单项选择题


A．under the sun
B．in the sun
C．in the world
D．on the world
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单项选择题
A．accessB．entranceC．approachD．method
A．access
B．entrance
C．approach
D．method
单项选择题
Which of the following is the best title for the text
A．Animals and Pain
B．Human Beings and Pain
C．Painful Stimuli and Reactions
D．Nerve System and Pain
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