单项选择题

A．8,000 people.
B．10,000 people.
C．80,000 people.
D．100,000 people.
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单项选择题
A．Fishing and hunting.B．He began to show great interest in natural beauty.C．Nuclear science.D．Amateur radio.
A．Fishing and hunting.
B．He began to show great interest in natural beauty.
C．Nuclear science.
D．Amateur radio.
单项选择题
A．The surface of the ocean is expanding.B．Volcanic activity is increasing.C．The surface of earth contains tons of cosmic dust.D．Thousands of comets arc colliding with earth’s atmosphere.
A．The surface of the ocean is expanding.
B．Volcanic activity is increasing.
C．The surface of earth contains tons of cosmic dust.
D．Thousands of comets arc colliding with earth’s atmosphere.
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