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.
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单项选择题
A．He already knows how to play.B．He doesn’t like to play games.C．He doesn’t have a partner,D．He doesn’t have enough free time.
A．He already knows how to play.
B．He doesn’t like to play games.
C．He doesn’t have a partner,
D．He doesn’t have enough free time.
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