D. scientists had long been looking for these caves

　　4. Necessary condition for life on Mars mentioned in the passage may include　.　

　　A. lava and energy

　　B. water and radiation from space

　　C. gases and lava

　　D. water and protection from radiation

　　【参考答案】1--4、CDBD

　　阅读理解。阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

　　Seen from space the earth is covered with a blue mantle. It is a planet on which the continents(洲，大陆) are dwarfed (相形见绌) by the ocean surrounding them and the vastness of the marine (海洋的) area.

　　An astonishing 80 percent of all life on earth is to be found hidden beneath the waves and this vast global ocean drives the natural forces which keep life on our planet. The ocean provides necessary sources of protein, energy, minerals and other products 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 suitable for living things to survive. Without the global ocean there would be no life on earth.

　　It is seriously worrying, then, that we are damaging the ocean on a level that is unimaginable to most people.

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