问题
单项选择题
药物的半数致死量(LD50)是指：
A．抗寄生虫药杀死一半寄生虫的剂量
B．致死半数动物的剂量
C．抗生素杀死一半细菌的剂量
D．产生严重副反应的剂量
E．致死量的一半
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
药物的半数致死量(LD50)是指：
A．抗寄生虫药杀死一半寄生虫的剂量
B．致死半数动物的剂量
C．抗生素杀死一半细菌的剂量
D．产生严重副反应的剂量
E．致死量的一半
参考答案：B
| 完形填空。 | ||||
| Li Peng: (L) and Yang Bin (Y) are talking about what they are going to do in the future L: What are you going to do after leaving school? Y: I'm thinking about becoming a pilot (飞行员). That way I would be able be travel. L: 1______ Y: Of course I do. I like to visit different places, make different friends and see different things. L: That sounds good. You seem to be very healthy. 2______ Y: It's just so-so. I find it is difficult to learn it well. L: What can you do if you are not good at English? Y: 3______ I'll try to learn it better. 4______ L: Maybe I'll be a businessman. I'd like to go into business and make some money. Y: 5______ L: But I think being busy is better than doing nothing. Y: Yes, I agree with you. | ||||
|