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医务人员。该模型也可以作为新研究的基础，探寻使用3D技术来制作全功能心脏来为人类使用。）可知，选D(A)29.Why did the scientists use a material called alginate?A.To prevent the model heart from collapsing.B.To enable the model heart to last longer.C.To make the model soft enough to look like a real one.D.To obtain as many materials from seaweed as possible.【解析】细节理解题。根据第六段“The new3 printing process was not easy,the Carnegie Mellon team said.This is because soft materials,such as collagen,start out as a liquid.When suh substancesare printed in thearthey quickly coein the proeecersmuwith therw mho tprintofmterials.The team'sw model heart is made romerlled aginate,oamade from seaweed,.”(新的3D打印流程也遇到了一些因难，卡耐基梅隆大学的团队说道。这是因为：像股原质这样的柔款村质一开始都是液态的，当这些物质被打印出来并提触到室气的时候，就会迅速分解。于是，研究人黄想到了用3D技术打印较软材质的方法。该团队的新心脏模型是用藻酸盐制作的，藻酸盐是用海藻制成的一种天然软性物质。)可知，选A。(C)30.Which model hasn't been printed yet according to the passage?A.Blood vessels.wwwB.A heart artery.niia四dno于od lobC.A human liver.D.A human heart.【解析】细节理解题。根据第七段“The group says the same methods could be used toreate other realisticorgan models as well,such as livers or kidneys..”可知“1 livers"是有待于将来用3D打印的器官之一。2(D)31.What is the main idea of the passage?A.The benefits of using biomaterials when printing something.B.Several things scientists should notice when printing human hearts.C.Scientists have successfully 3D printed several human tissues.D.Scientists have created the first full-size 3D printed human heart model.【解析】主旨大意题。第一段的第一句话“American researchers say they have created the first full--size humanheart model using3 D printing technology.”(美国研究人员称自己用3D打印技术制作了第一个全尺寸的人类心脏模型。)就是该文的主题句。o esoig w boinomioqxo oals and mla'dA seismic(shift in climate science might be heating up.New research shows that sound waves,produced by earthquakes,can be used to measure temperatures in the ocean which traps 90%of the heatEarth absorbs from the sun,making long-term changes in ocean warmth,a major factor in how the worldmight respond to global warming.For years the main approach of measuring ocean temperature has been Argo,an array()of 4,000automatic floats which drifts the globe,sampling ocean water and measuring its temperature.Yet Argomeasurements stop at 2,000 meters.The new technique called“Seismic Ocean Thermometry(温度测量)”，would be especially useful indetecting long-term changes in ocean temperatures deeper than Argo's reach."Ocean Acoustic Tomography",the basis for the current research,was first tested nearly 30 years ago.The initial studies created sound wavesartificially,basically inereasing the volume on giant underwater speakers.Scientists measured the sound'stravel time from the speakers to rivers thousands of kilmeters away.Becausetemperatures affectthe sped of the waves,the researchers could calculate average temperatures along their paths.Butsombelieved the noise was a threat to ocean life and the technique never took off.eew study instead uesnatural soundourc forntitin:carthquakes makingbeath theafloor offh fmra thatouwavesin thetherofthe Cho inth Est Indianndi Dgarecorded seismic waves produced by those earthquakes.Some of those waves created physical changes in land英语试题（雅礼版）一26