单项选择题

______from space, our earth, with water covering 70% of its surface, appears to be a blue ball.

A. Seen
B. Seeing
C. Having seen
D. To see
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单项选择题
Very few people could understand the lecture the professor delivered because its subject was very______.
A. intriguing
B. indefinite
C. obscure
D. detailed
单项选择题
Although the colonists ______ to some extent with the native Americans, the Indians' influence on American culture and language was not extensive.
A. migrated
B. matched
C. mingled
D. melted
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