题目

  Louis Pasteur was a world-famous French chemist and biologist. He is particularly famous for his work on rabies vaccine (狂犬病疫苗). The rabies virus enters the body through the bite of an infected animal or through infected saliva (唾液) entering an existing wound. After experimenting with the saliva of animals suffering from the disease, Pasteur concluded that the disease rests in the central nervous system of the body. By studying the tissues of infected animals — rabbits, Pasteur was able to produce a form of the virus. This could be used for inoculation (接种). On李明同学做种子萌发的实验，方案如下表。请分析回答：瓶号1234种子10粒种子10粒种子10粒种子10粒种子环境条件不放水，温暖处放适量水，温暖处放适量水，冰箱内放过量水，温暖处（1）实验结果是：只有______号瓶的种子能够正常萌发。（2）1号种子不萌发的原因是_____，可用_____号瓶和______号瓶为一组对照实验验证。（3）如果要证明“种子萌发需要充足的空气”，应选择______号瓶和______号瓶为一组对照实验。（4）种子萌发的环境条件是和______、______和_____。