Question

【题目】From space, the earth looks blue. This is __________ about seventy-one percent of its surface is covered by water.

A. why B. how

C. because D. whether

Answer 1

【答案】C

【解析】句意:从太空看，地球是蓝色的。这是因为地球表面大约71%都被水覆盖着。本题考查表语从句。A:为什么；B:怎么样；C:因为；D:是否。根据句意应选C。