(2013·安徽，21)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，21)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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