【正确答案】　　The two pictures given inform us of the brief history of world commercial fishing. From the upper picture we learn that the year 1900 saw a quite encouraging scene of world fishing: there were a great variety of fishes, but a limited number of fishing-boats in the ocean. However, a worrying change took place in the period of time from 1900 to 1995. As is shown in the lower picture, with the sharp development of world commercial fishing, the ocean became crowded with different kinds of fishing- boats and hence there were few fishes in it. It is clear that a disastrous change occurred in the previous 95 years. 　　As far as the purposes of the drawer of the pictures are concerned, they are as follows. To begin with ,he intends to warn us of the over-exploitation of marine resources, including fish, which will inevitably result in the extinction of many species of marine organisms. Secondly, he aims to draw our attention to the protection of marine resources in every possible way. Finally, the drawer wants, I think, to render the idea that the sea fish resources, which help to keep a large population from being hungry, will be completely ruined if the present situation of overfishing continues at an accelerated rate. 　　In my opinion, a series of counter-measures should be taken to reverse the current dangerous tendency. On the one hand, the governments throughout the world are supposed to set up as many marine nature reserves as possible to protect marine organisms. On the other hand, it is urgent that the world commercial fishing be put under control because overfishing is one of the factors which are responsible for the present situation. Only in this way can we protect marine resources from being destroyed someday.