The Internet has  become part of young people’s life.     64     report shows  that 38% of students often use the Internet. Most of them get _   65     (use)  information on the Intern    
                        
                     
                                
                                           
                        
                        
                            下图是光合作用的过程示意图。请据图回答:  (1)写出各字母所代表的物质:b________,c________,e________。 (2)由e经碳反应产生f,可以分成________和________    
                        
                     
                                
                                           
                        
                        
                            设,则双曲线的离心率的取值范围是(    ) A.             B.    C.            D.    
                        
                     
                                
                                           
                        
                        
                            --Who  cleaned the room yesterday? --_______. A. I  was  B. I did  C. I cleaned       D. I am    
                        
                     
                                
                                           
                                
                                           
                        
                        
                            某小型火力发电厂(以煤为燃料)排放大量的废气,对周围的空气产生了严重污染,并导致当地常降酸雨。为探究废气的成分,实验中学化学课外活动    
                        
                     
                                
                                           
                        
                        
                            You’ll find this book of great        to those who are learning English.    A. usefulness                  B. value                       C. price      
                        
                     
                                
                                           
                        
                        
                            向某稀HNO3和Fe(NO3)3的混合溶液中逐渐加入铁粉,产生无色气体.该气体遇空气变红棕色,溶液中Fe2+浓度和加入  Fe粉的物质的量之间的关系如图所示:则