题目内容
用适当的连词填空
1. From space, the earth looks blue. This is_______ about seventy-one per cent of its surface is covered by water.
用适当的连词填空
1. because is后面为表语从句。表示原因，所以用because,句意：从太空上看，地球是蓝色的。这是因为地球表面大约71%被水覆盖。
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用适当的连词填空
1. From space, the earth looks blue. This is_______ about seventy-one per cent of its surface is covered by water.
用适当的连词填空
1. because is后面为表语从句。表示原因，所以用because,句意：从太空上看，地球是蓝色的。这是因为地球表面大约71%被水覆盖。