A. sit quietly before the exam
B. prepare well before the test
C. set their mind on happy memories
D. write about their feelings before the test
19.The result of the research suggests that ________.re
D. taking no action before difficulty may result in success
B
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.de 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 unimaginable to most people.
We now know that human activity can have serious influences on the vital forces governing 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 the 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.being exerted both directly and indirectly on ocean ecosystems the world over. Consequently ecosystems are collapsing as marine species are driven towards extinction and ocean habitats are destroyed. With the decrease and removement of their diversity, ocean ecosystems are losing their natural recovery.
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