正确答案: C
            春秋 
            题目:我国铁农具开始出现于
             解析:C
 
             查看原题查看所有试题 
            学习资料的答案和解析:
                                                    
                                 
                
                 [单选题]At school most of his teachers ______ the author.
                                                
                  
                                                                         were cold to B. didn’t notice 
                                                                                        
                
                
                            
                
                 [单选题]10. The beef is __________dear. Let-s not buy .
                                                
                  
                                                                         much too ,too much 
                                                                                                                                                                                
                
                
                            
                
                 [单选题]When do you have history?—_______10:00.
                                                
                  
                                                                                                                                                                 At 
                                                                                        
                
                解析:1.C  【解析】表示“在(几点钟)”要用at. 
                            
                
                 [单选题](二)阅读下面文章,完成11——12 题(7 分)人造的树叶会发电
                                                
                  
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             容易捕捉氧气和氢气并储存它们,以备在没有阳光时使用。