3．Seen from space the Earth is covered in a blue mantle．It is a planet on which the continents are dwarfed （相形见绌）by the oceans surrounding them and the vastness of the marine area．
An astonishing 80 percent of all the life on Earth is to be found hidden beneath the waves and this vast global ocean pulses around our world driving the natural forces which keep life on our planet．
The oceans provide necessary sources of protein，energy，minerals and other products of use the world over and the rolling of the sea across the planet creates over half our oxygen，drives weather systems and natural flows of energy and nutrients around the world，transports water masses many times greater than all the rivers on land combined and keeps the Earth habitable．
Without the global ocean there would be no life on Earth．
It is seriously worrying，then，that we are damaging the oceans on a scale that is unimagnalbe to most people．
We now know that human activity can have serious influences on the vital forces working-on our planet．We have fundamentally changed our global climate and are just beginning to understand the consequences of that．As yet largely unseen，but just as serious，are the influences we are having on ihe oceans．A healthy ocean has diverse ecosystems and strong and healthy habitats．the actual state of our oceans is a far cry from this natural level．
A large quantity of human pressures are being exerted both directly and indirectly on ocean ecosystems the world over．Consequently ecosystems are collapsing as marine speciesare driven towards extinction and ocean habitats are destroyed．With the decrease and removement of their diversity，ocean ecosystems are losing their natural recovery．
59．The 2nd and the 3rd paragraphs are given mainly to describeD．
A．what the oceans look like
B．what the oceans are made up of
C．what live in the oceans
D．what functions the oceans have
60．The oceans provide all the following exceptC
A．various marine creatures
B．rich living resources
C．all natural forces
D．comfortable habitats for man
61．Man has not yet realizedA
A．that he has done harm to the oceans
B．that he has done harm to the planet
C．that he has benefited from the oceans
D．that he has benefited from the planet
62．The best title for this passage should beB
A．Protecting our planet
B．Defending our oceans
C．Making good use of our oceans
D．A glimpse of the oceans．
分析 本文主要介绍了海洋的作用，以及人类对海洋造成的破坏．在海洋中生活了各种各样的生物，它为这些生物提供了舒适的栖息地，而且海洋里的资源也很丰富．但是人类活动对海洋生态系统造成了很大的伤害，因此我们应该保护海洋．
解答 59．D 段落大意题．根据第二段this vast global ocean pulses around our world driving the natural forces which keep life on our planet．和整个第三段的内容可知海洋为人类提供了很多资源．由此推知，这两段都在说明海洋的作用．故选D．
60．C 细节理解题．根据第二段An astonishing 80 percent of all the life on Earth is to be found hidden beneath the waves可知在海洋中生活了各种各样的生物．选项A正确；根据第三段The oceans provide necessary sources of protein，energy，minerals…可知海洋中生物资源很丰富．选项B正确；根据倒数第二段A healthy ocean has diverse ecosystems and strong and healthy habitats可知海洋为生物提供了舒适的栖息地．选项D正确．而选项C是对文章的错误理解．故选C．
61．A 细节理解题．根据倒数第二段As yet largely unseen，but just as serious，are the influences we are having on ihe oceans．可知人类尚未意识到他们已经伤害了海洋．故选A．
62．B 标题概括题．通读全文可知，本文主要介绍了海洋的作用，以及人类对海洋造成的破坏，并且告诫人们要保护海洋．故选B．
点评 本文考察学生的理解推断能力以及细心程度，只要抓住文章的关键词，采用寻读的方法查找细节，就能找到正确答案．
