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When was this color footage of victims classified?
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What’s the death toll of the nuclear bomb explosion in Hiroshima?
Exercise 2Directions: Please completeoneof the following three gap-filling tasks .A. The Iran Nuclear DealFive main areasWhat should Iran do?1.Iran’s1Iran should give up 97% of its2 .2.Uranium enrichmentIran can still enrich uranium3 .3.4Iran has to give up5 of its centrifuges.Itcan keep 1000 more for6 .4.Inspections7 will be allowed to monitor nuclear and other sites.Iran can challenge8 .What does Iran get for acceptingall of this?5.9Many energy economic and financial sanctions against Iran will be10 .It’s expected to massively11 , increase trade and 12 into the country.The significanceA major13 between Iran and the West.The opponents’ worriesIt will increase14 of organizations like Hezbollah and the Assad regime.It will allow Iran to move back to the brink of15 without paying any price.
Exercise 3Directions: Please supply the missing information with the words you hear.B. CanYou Survive Nuclear Fallout?VocabularyFallout(核爆炸后的)沉降物nuclear fission 核裂变 nucleus (原子)核 nuclei 原子核（复数）neutron中子 decimate大批杀害 ionizing radiation 电离辐射Nuclear fissionDefinition:An atom’s1 is split in two.Theneutronsproduced by one fission2additionalnuclei.Power：These chain reactions canproduce a range of3.An explosion equivalent to10,000 tons of TNT is capable of4a few city blocks.Survival tipsThe best way is5insidea sturdybuilding.6is especially important if the fireball occurs close to the earth.FalloutIt’s the most dangerouslong-termeffectof a7Radioactive particles emit8Radiation results includecell damage,9,radiation sickness,cancer, and even death.Radiation is reduced as ittravels through10.Protection11of steel, concrete, and packed earth can offer seriousprotection.Stayinginside for 24 hours could greatly12of avoiding the radiation effects.Makingideal shelters undergroundor in the middle of high-risebuildings.Removing shoes and13, washing any14, and store the contaminated clothing far away.15for more information from first responders.
从古至今，化学的发展经历了（公元前3世纪到18世纪中期）、（18世纪后期至19世纪末）和（20世纪以来）3个阶段。
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