(2013·高考安徽卷)From space，the earth looks blue.This is ________ about seventy­one percent of its surface is covered by water.
A．whyB．how
C．becauseD．whether
選C。本題考查表語從句的引導(dǎo)詞。句意：從太空看，地球是藍(lán)色的。這是因為它表面大約71%被水所覆蓋。首先分析前后兩句之間的邏輯關(guān)系，此處為“前果后因”，使用because，故選C項。because和why均可引導(dǎo)表語從句，解題時要弄清前后句之間的邏輯關(guān)系——是“前因后果”還是“前果后因”�！扒耙蚝蠊笔褂脀hy，“前果后因”使用because。
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