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                                                            S1: One of the most dangerous insect pests is the locust. P: At first they look just like ordinary grasshoppers, which are harmless and unable to fly very far. Q: Until about thirty years ago, no one knew where locusts came from or why they appeared in the different countries they attacked. R: Then they change in appearance and develop wings which enable them to fly long distance. S: Then it was discovered that there are two stages in the life of locusts. S6: At this stage, they gather in huge numbers and rise from the ground on theri powerful wings in cloud. The Proper sequence should be:
                                    
                
                
            
            
            
            
                                                
                        
            
            
                        
            
                
                
                
            
                        
                        
            
            
                        
            
                
                
                
            
                        
                        
            
            
                        
            
                
                
                
            
                        
                        
            
            
                        
            
                
                
                
            
                        
                        
            
            
                        
            
                
                
                
            
                        
                     
        
     
            
            
            
         
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