某实验小组探究“裸地、草地、灌丛中细菌和真菌分布情况”方案如下：

（1）制备培养基时进行高温灭菌，目的是____．

（2）表中A相当于细菌、真菌培养一般方法中的哪一步骤？____．

（3）在观察和记录时所看到的菌落是由一个细菌成真菌繁殖后形成的肉眼可见的集合体．那么，细菌和真菌的繁殖方式分别是____ 

（4）比较1、2、3号培养皿内的菌落数，你得出的结论是____

黄土高原地表千沟万壑，支离破碎的原因（　　）

    Have you ever wondered about the secret life of the tasty lobster(龙虾)？In the sea, it is yellow, orange, grey, green, brown or even blue. Cooking turns it red.

    Lobsters are nocturnal creatures(夜行物)，so it is best to hunt(捕捉) them at night when they are active. You can catch lobster by hand, but you should wear thick gloves because lobster's claws are strong. A very large lobster could break your finger.

    Interestingly, in the past, lobsters were only served to prisoners as they were considered as a poor man's food. Nowadays, lobsters are an expensive and popular dish.