题目内容（请给出正确答案）

[主观题]

A．The surface of the ocean is expanding.B．The surface of earth contains tons of cosmic

A．The surface of the ocean is expanding.

B．The surface of earth contains tons of cosmic dust.

C．Volcanic activity is increasing.

D．Thousands of comets are colliding with earth's atmosphere.

提问人：网友whywhyd 发布时间：2022-01-07

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