[2013·安徽卷] From space, the earth looks blue. This is ________ about seventyone percent of its surface is covered by water.
A.why | B.how |
C.because | D.whether |
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[2013·安徽卷] From space, the earth looks blue. This is ________ about seventyone percent of its surface is covered by water.
A.why | B.how |
C.because | D.whether |