Hunting and fishing have directly 【小题1】 the world’s animal populations. Some people hunt animals for food: whale meat is eaten in some parts of the world. Some people hunt animals for fashion: animal skin is used to make costs and bags. Still others hunt animals just for fun: deer are 【小题2】 and shot by people who enjoy the 【小题3】 of the sport.

Human activities that have 【小题4】 effects on animals can be just as harmful. When we build farms or factories, we destroy animal 【小题5】 and leave many animals with 【小题6】 to live, or no food to eat. We can also put animals in danger without ever entering their habitats. Air, water, noise and light pollution can all have a deep and 【小题7】 influence quite far from their source. 【小题8】 due to pollution 【小题9】 by ship traffic and other human activities, the dolphin population has dropped greatly. As the human population continues to grow, 【小题10】 does the effect we have on animals.

As we all know, there are varieties of resources in the depths of the sea. However, 【小题1】 (随着时间的流逝)，some marine creatures have died out. Therefore, marine pollution has been of great global concern.

First of all, 【小题2】 (迫切需要) make people aware of the importance of protecting the ocean, because 【小题3】 (保护海洋就是保护人类，不定式作主语和表语). 【小题4】 (与此同时), we 【小题5】 (赞成政府采取有效措施) to keep the balance of nature. No matter how great the difficulty is, we will have the marine resources properly 【小题6】 (exploit) and never will we give up protecting the ocean.

As that heat rises, some of it is 【小题1】 by gases in the atmosphere and reflected back towards the planet’s 【小题2】. Like the glass in a greenhouse 【小题3】 holds heat inside the building, gases in the air hold in heat around Earth. Scientists call this global heat-trapping 【小题4】 the greenhouse effect. The greenhouse effect keeps the temperature of our planet’s surface comfortably warm.

Several gases in the atmosphere 【小题5】 to global warming. The one you’ve 【小题6】 heard the most about is carbon dioxide. Carbon dioxide is a good heat-trapping gas—a greenhouse gas, 【小题7】 scientists say. 【小题8】 certain amount of carbon dioxide in the atmosphere is 【小题9】. In fact, you add some 【小题10】 the air every time you breathe out.