更多"In the past, man didn’t have to thi"的相关试题:
[单项选择]In the past, man didn’t have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be (56) . Today things are (57) . The world has become too (58) . We are using up our natural resources too quickly, and at the same time we are (59) our environment with dangerous chemicals. If we (60) to do this, human life on the earth will not survive.
Everyone (61) toady that if too many fish are taken from the sea, there will soon be none left. Yet, with modem fishing (62) more and more fish are caught. We know that if too many trees are cut down, (63) will disappear and nothing will grow on the land. Yet, we (64) to use bigger and more powerful machines to (65) more and more trees.
We realize that if rivers are polluted with waste products from factories, we will die. (66) , in most countries wastes ar
A. beautiful
B. unlimited
C. limited
D. natural