X 线照片某处对入射光线吸收率为90%，此处的光学密度值为
A、0．1C
暂无解析
PartIVTranslation：
Almost30millionAmericansweightatleast20percentmorethantheiridealweight.Infact,theUnitedStateisthemostoverweightcountryinthewild.(PassageThree)
______isnotaseriousdisadvantageinlife.
Underno_____willIgothereagain.
Thebesttitleforthepassagewouldbe________.
PartIVTranslation
Combinedwiththemessagingservice,thelocationservicecouldhelprescueteamstofindstrandedadventurers,thepolicetofindstolencars,exporterstofollowtheprogressofcargoes,andhaulagecompaniestocheckthatdriversarenotdetouringthepub.(PassageFour)
