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          From space, the earth looks blue. This is      about seventy-one percent of its surface is covered by water.
          A．whyB．howC．becauseD．whether
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          why為什么;how怎樣, 如何;because因?yàn)?whether是否. 句意:從太空中望去, 地球看起來(lái)是藍(lán)色的. 這是因?yàn)樗谋砻娲蠹s百分之七十被水覆蓋. why在引導(dǎo)表語(yǔ)從句時(shí)強(qiáng)調(diào)結(jié)果，如: She was ill. That’s why she was sent to the hospital. 她病了，所以被送到醫(yī)院來(lái)(那就是她為什么被送到醫(yī)院的原因)。Because引導(dǎo)表語(yǔ)從句強(qiáng)調(diào)原因,結(jié)合語(yǔ)境可知選C.
          【考點(diǎn)定位】連詞辨析
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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