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          The scientists are studying the effects of human activities______the environment.
          A．inB．a(chǎn)tC．onD．with
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          此處所填的介詞與effects搭配, 對……的有影響, 用 effect on/upon表示。我們也可以聯(lián)想所學(xué)短語 have an effect on sth。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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