1、单选题:The first microscopes were developed by:选项:A:EhrlichB:ListerC:LeewenhoekD:Metchnikoff答案: 【Leewenhoek】
2、单选题:Who firstly invented micorscope and oberserved bacteria?选项:A:Lou...
1、单选题:Which has been used in the kitchen during Qin dynasty.( )选项:A:Vinegar
B:salt
C:Spinach
D:onion
答案: 【Vinegar】
2、单选题:What is the meaning of the word “gratuity”.( )选项:A:...