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                  cycling is a fantastic way to burn a few calories and save some money, there still exist risks．
          A．SinceB．WhileC．AsD．When
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：此處Since 自從；While 盡管；As因?yàn)�；When當(dāng)……的時(shí)候。句意：盡管騎自行車是燃燒熱量的奇妙的方法，但也存在風(fēng)險(xiǎn)。根據(jù)句意選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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