補(bǔ)全短文world problem

　　a very important world problem-in fact， i am inclined to say it is the most important of all the great world problems________(1) _________-is the rapidly increasing pressure of population on land and on land resources.

　　this enormous increase of population will create immense problems. by 2000 a.d.， unless something desperate happens， there will be as many as 7，000，000，000 people on the surface of the earth！ so this is a problem which you are going to see in your lifetime why is this enormous increase in population taking place？ it is really due to the spread of the knowledge and the practice of _________ (2)_______。 you have heard of birth control？ death control is something rather different. death control recognizes the work of the doctors and the nurses and the hospitals and the health services in keeping alive people who，_____(3)_____， would have died of some of the incredibly serious killing diseases ， as they used to do. squalid conditions， which we can remedy by an improved standard of living， caused a lot of disease and dirt. medical examinations at school catch diseases early and ensure healthier school children. scientists are at work stamping out malaria and other more deadly diseases. if you are seriously ill there is an ambulance to take you to a modern hospital. medical care helps _____(4)______。 we used to think seventy was a good age; now eighty， ninety， it may be ， are coming to be recognized as a normal age for human beings. people are living longer because of this death control， and _____(5)_____， so the population of the world is shooting up.

　　練習(xí)：

　　a fewer children are dying

　　b a few years ago

　　c what is coming to be called death control

　　d which face us at the present time

　　e making it possible for people to live longer

　　f to keep people alive longer

　　keys： dcbfa