【单选题】Desert plants ______ two categories according to the way they deal with the problem of surviving drought.
                    
A.break down
B.fall into
C.differ in
D.refer to
                
							【单选题】Desert plants ______ two categories according to the way they deal with the problem of surviving drought.
                    
A.break down
B.fall into
C.differ in
D.refer to
                
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