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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 describe  ______.

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 except ______

A. various marine creatures                          B. rich living resources

C. all natural forces                                     D. comfortable habitats for man

61.  Man has not yet realized ______

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 be ______

A. Protecting our planet                                B. Defending our oceans

C. Making good use of our oceans                D. A glimpse of the oceans

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Fish Ears Tell Fish Tales

  Fish have ears. Really. They’re quite small and have no opening to the outside world carrying sound through the body. For the past seven years, Simon Thorrold, a university professor, has been examining fish ears, small round ear bones called otoliths (耳石).

  As fish grow, so do their otoliths. Each day, their otoliths gain a ring of calcium carbonate (碳酸钙). By looking through a microscope and counting these rings, Thorrold can determine the exact age of a young fish. As a fish gets older, its otoliths no longer get daily rings. Instead, they get yearly rings, which can also be counted, giving information about the fish’s age, just like the growth rings of a tree.

  Ring counting is nothing new to fish scientists. But Thorrold has turned to a new direction. They’re examining the chemical elements (元素) of each otolith ring.

  The daily ring gives us the time, but chemistry tells us about the environment in which the fish swam on any given day. These elements tell us about the chemistry of the water that the fish was in. It also says something about water temperature, which determines how much of these elements will gather within each otolith ring.

  Thorrold can tell, for example, if a fish spent time in the open ocean before entering the less salty water of coastal areas. He can basically tell where fish are spending their time at any given stage of history.

  In the case of the Atlantic croaker, a popular saltwater food fish, Thorrold and his assistant have successfully followed the travelling of young fish from mid-ocean to the coast, a journey of many hundreds of miles.

  This is important to managers in the fish industry, who know nearly nothing about the whereabouts of the young fish for most food fish in the ocean. Eager to learn about his technology, fish scientists are now lending Thorrold their ears.

1.What can we learn about fish ears from the text?

 A. They are small soft rings.

 B. They are not seen from the outside.

 C. They are openings only on food fish.

 D. They are not used to receive sound.

2.Why does the writer compare the fish to trees?

 A. Trees gain a growth ring each day.

 B. Trees also have otoliths.

 C. Their growth rings are very small.

 D. They both have growth rings.

3.Why is it important to study the chemistry of otolith rings?

 A. The elements of the otoliths can tell the history of the sea.

 B. Chemical contents of otoliths can tell how fast fish can swim.

 C. We can know more about fish and their living environment.

 D. Scientists can know exactly how old a fish is.

4.How would you understand “fish scientists are now lending their ears”?

 A. They are very interested in Thorrold’s research findings.

 B. They want to know where they can find fish.

 C. They lend their fish for chemical studies.

 D. They wonder if Thorrold can find growth rings from their ears. 

 

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