题目内容：
根据所听内容及提问，作答____[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 are colliding with earth's atmosphere.
参考答案：
答案解析：
单选题：根据所听内容及提问，作答____[A] The surface of the ocean is expanding. [
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[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 are colliding with earth's atmosphere.