问题
单项选择题
配置培养基，三角瓶的棉塞外面包一层牛皮纸或双层报纸，以防（）
A、灭菌时冷凝水滴湿棉塞
B、PH变化
C、空气进入瓶内
D、温度波动大
答案
参考答案：A
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配置培养基，三角瓶的棉塞外面包一层牛皮纸或双层报纸，以防（）
A、灭菌时冷凝水滴湿棉塞
B、PH变化
C、空气进入瓶内
D、温度波动大
参考答案：A
| 完形填空。 | ||||
| A wolf went to a farm. It ate the farmer's 1 . The farmer was angry. He had a gun (枪). He 2 to kill (杀死) the wolf. The wolf 3 away. It saw Mr Bell on the way. It asked the man for 4 . Mr Bell was 5 . He helped the wolf and let it hide (藏) 6 his bag. The farmer 7 see the wolf and asked Mr Bell: "Did you see a wolf?" Mr Bell answered: "Yes, it ran to the mountain just now." 8 the farmer went away, the wolf jumped (跳) out of the 9 to eat Mr Bell. Mr Bell cried: "I saved (救) you, 10 now you want to kill me. You are a 11 wolf!" At this time, the farmer 12 the gun came. He killed the wolf and saved Mr Bell. They were 13 . And 14 knew that he did wrong. The story 15 us, "Never take pity on an enemy (不要对敌人仁慈)." | ||||
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