情景一：小兵在2013年的中考中，如愿以偿，考入了市里的重点高中。他决定这个暑假玩个痛快，于是泡在网吧中昼夜不归。新学期开始了，小兵的座位却还是空着的。

情景二：小学时，小宁的乒乓球一直打得不错，曾获得许多奖状。上了中学，在第一次乒乓球小组赛中，就以大比分被淘汰，她失望极了，伤心地收起球拍，发誓再也不打了。从此很长时间闷闷不乐，学习也受到了影响。

情景三：小宋做家庭作业时有不少坏毛病，如总想找机会看看电视，听听音乐，吃吃水果，打打电话，因此，别的同学一个小时就能完成的作业，他总是要用近三个小时。第二天上课，又因睡眠不足而无精打采。

情景四：小刚以优异的成绩从西南农业大学毕业了，他立志要把自己学到的知识用于祖国西北的建设中。在当地政府的支持下，他终于在自己承包的一片土地上开始了事业的起点，辛勤的耕耘终于得到了回报，一片片幼林开始成长。就在此时，合作伙伴们却纷纷撤退，此时，他痛苦极了，如果他也走了，这里将重新变成沙漠，那就前功尽弃了。

关于艾弗里“肺炎双球菌转化实验”和“噬菌体侵染细菌实验”的叙述中，正确的是（  ）  

Skin-diving(潜水) is a new sport today. This sport takes you into a wonderful new world. It is like a visit to the moon. When you are under water, it is easy for you to climb big rocks, because you are no longer heavy.
Here, under water, everything is blue and green. During the day, there is lots of light. When fish swim nearby, you can catch them with your hands.
When you have tank (罐) of air on your back, you can stay in deep of water for a long time. But you must be careful when you dive into deep water.
To catch fish is one of the most interesting parts of this sport. Besides, there are more uses for skin-diving. You can clean ships without taking them out of the water. You can get many things from the deep sea.
Now you see that skin-diving is both useful and interesting.

读漫画《过年回家》，完成下列各题。