contain vital genetic properties still regularly used in plant breeding.

　　To survive，the seeds need freezing temperatures.Operators plan to replace the air inside the

　　vault each winter,when temperatures in Spitsbergen are around-18℃.But even if some disaster

　　meant that the vault Was abandoned,the permanently frozen soil would keep the seeds

　　alive. And even accelerated global warming would take many decades to penetrate the mountain

　　vault.

　　“This will be the world’s most secure gene bank， ” Says Fowler. “But its seeds will only

　　be used when all other samples have gone for sOme reason. ”

　　The project comes at a time when there is growing concern about the safety of existing

　　seed banks around the world.Many have been criticized for their poor security, ageing

　　refrigeration(冷藏)systems and vulnerable electricity supplies.

　　The scheme won UN approval at a meeting of the Food and Agriculture Organization in

　　Rome in October 2005.A feasibility study said the facility“would essentially be built to last

　　forever” .

　　46.The Norwegian yault is important in that_________________.

　　A.the seeds in it represent the rarest varieties of world’S crops

　　B. the seeds in it could revive agriculture if the worst thing should happen

　　C.it is built deep in a mountain on a freezing-cold Arctic island

　　D.it is strong enough against all disasters caused by man and nature

　　答案：B

　　47.The seed bank project was proposed by_____________.

　　A.the Norwegian government B.Norwegian farmers

　　C. Spitsbergen residents D. agricultural scientists

　　答案：D

　　48. The seeds in the vault will be stored___________________.

　　A.as samples of world crop varieties

　　B. as produc of world plant breeding

　　C.for their valuable genetic properties

　　D.for their resistance to plant diseases

　　答案：A

　　49 . For the seed bank project to be successful ， the most important factor is

　　probably______________.

　　A.constructing tight airlocks

　　B. maintaining high security

　　C.keeping freezing temperatures

　　D.storing large quantities of seeds

　　答案：B

　　50.Which of the following statements is true?

　　A.The Norwegian vault models after existing seed banks.

　　B.The Spitsbergen seed bank is expected to last 10,006 years.

　　C. The existing seed banks have potential problems.

　　D.The UN financed the Spitsbergen seed bank.

　　答案：C

　　Passage Five

　　Probably the hardest part of setting goals is the first step of actually deciding to take action!The

　　first barrier facing most people is the incorrect assumption that goals are only for business

　　people. The reality is everyone sets goals mentally throughout the day. There arealways occasions

　　where something has to be done at a particular time Or in a particular place.Simple examples

　　could be getting up at a certain time in order to be at work，or to meet with a friend for a leisure