问题补充：
---What is our earth like from the moon?
---Well, our earth, with water 70% of its surface, appears as a blue ball.
A. seen; covering
B. seen; to cover
C. seeing; covered
D. seeing; covering
答案：
(答案→)A. seen; covering
B. seen; to cover
C. seeing; covered
D. seeing; covering
解析：考查非谓语动词。句意：从月球上看，我们的地球像什么？——嗯，我们的地球，有水覆盖在它70%的表面，像一个蓝色的球。过去分词表示被动的，发生过的动作，和句子主语是动宾关系。现在分词表示正在进行的伴随性的动作，和句子主语是主谓关系。结合句意可知上文为被动动作，下文为主动的伴随性动作，故选A。
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