改错题
During the past quarter century the power for man to alter the nature of his world has not only been increased to one of disturbing magnitude but it 【M1】______ has changed in character. The most alarming of all man's assaults upon the environment is contamination of air, earth, rivers, and sea with dangerous 【M2】______ and even lethal materials. This pollution is for most part irrecoverable; the 【M3】______ chain of evil it initiates not only in the world that must support life but in living tissues is reversible. In this now universal contamination of the envi- 【M4】______ ronment, chemicals is the sinister and little-recognized partner of radiation 【M5】______ in changing the very nature of the world and its life. Strontium 90, releasing 【M6】______ through nuclear explosions into the air, comes to earth in rain or drifts down as fallout, lodges in soil, enters into the corn or wheat growing there, and in 【M7】______ time takes up its abode in the bones of a human being. Similarly, chemicals sprayed on croplands or forests or gardens lying long in soil, entering into 【M8】______ living organisms, passing from one to the other in a chain of poisoning and 【M9】______ death. Or they pass mysteriously by underground streams until they emerge and combine into new forms that kill vegetation, sicken cattle, and make un- 【M10】______ known harm on those who drink from once pure wells. As Albert Schweitzer has said,""Man can hardly even recognize the devils of his own creation."