单项选择题

______ from space, our earth, with water covering 70% of its surface, appears a "blue planet".

A．Seen
B．Seeing
C．To be seen
D．Having seen
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问答题
Directions: You are to write in no less than 120 words about the title Finding a Friend over the Internet . Study the picture below carefully and your composition should be based on the information given.1. Describe what you see in the picture.2. Guess what the picture really wants to imply.3. Draw your own conclusion.
单项选择题
A．whenB．whatC．whereD．which
A．when
B．what
C．where
D．which
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