2019年mpa考试英语真题——介词和介词短语1713

{01}It"s great fun to go hiking in the valley, but______, we shouldn"t turn a blind eye to the potential risks.  
A.on the other hand  
B.on the contrary  
C.as a matter of fact  
D.as a result
解析：
本题选A。

{02}Don"t be angry with the boy. He made the mistakes _________.
A.on purpose      
B.by accident      
C.in surprise        
D.at once
解析：
本题选B。