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          For our middle school students, some courses are compulsory, while others are ______. 

          A. flexible 
          B. optional 
          C. impressive 
          D. significant 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				B				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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				科目：高中英語(yǔ)
				來(lái)源：江蘇省2012屆度高三上期初調(diào)研測(cè)試（英語(yǔ)）
				題型：單項(xiàng)填空
			
          
									
          For our middle school students,
some courses are compulsory, while others are ________.
          


          A. flexible     B.
optional         C. impressive           D.
significant
          


           
          

			
          
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				科目：高中英語(yǔ)
				來(lái)源：專項(xiàng)題
				題型：單選題
			
          
									
          For our middle school students, some courses are compulsory, while others are ______. 
          

          [      ]
          A. flexible 
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          D. significant 
          

			
          
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