题目内容：

    All living things in the ocean are endangered by humans polluting the water. 1. One way is the dumping( 倾倒) of certain waste materials, such as garbage and used water, into the ocean. The harmful bacteria that feed on the garbage use up much of the oxygen in the surrounding water, so other creatures in the area often don’t get enough.

Other substances( 物 质 ), such as radioactive waste material, can also cause pollution. 2. But after years of being exposed to the ocean water, the containers may begin to leak(漏).

 3. Oil is spilled into the ocean when oil ships sink or when oil wells in the ocean cannot be capped. The oil covers the gills( 腮 ) of fish and prevents them from breathing. Diving birds get the oil on their wings and are unable to fly. When they clean themselves, they are often poisoned by the oil.

Rivers also  can  contribute to the  pollution of oceans. 4. Fertilizers  used  on  the farmlands may be carried to the ocean, where they cause a great increase in the amount of certain plants. Too much of some plants can actually be poisonous to fish.

Worse yet are the pesticides(杀虫剂) carried to the ocean. these chemicals slowly build up in fish and other small animals. 5. The buildup of these chemicals in the animals can make them ill or cause their babies to be born dead or sick.

A Fish and turtles suffer the most

B Pollution occurs insseveral ways.

C Oil is another major source of concern

D Many rivers receive the runoff water from farmlands

E Farmers use these artificial fertilizers to increase crop harvest.

F These materials are often placed in the water in safely sealed containers.

G These animals then pass the pesticides on to the larger animals that feed on them.