题目内容：
Questionsarebasedonthefollowingpassage:
Alltheusefulenergyatthesurfaceoftheearthcomesfromtheactivityofthesun．Thesunheatsandfeedscreaturesandmankind．Eachyearitprovidesmenwithtwohundredmilliontonsofgrainandnearlytenmilliontonsofwood,coal,oil,naturalgas,andallotherfuelsarestoredenergyfromthesun．Somewascollectedbythisseason'splantsascarboncompounds．Somewasstoredbyplantsandtreesagesago．
Evenwaterpowerderivesfromthesun．Waterturnedintovaporbythesunfailsasrain．Itcoursesdownthemountainsandisconvertedtoelectricpower．Lighttransmitsonlytheenergythatcomesfromthesun'souterlayer,andmuchofthisenergythatisdirectedtowardstheearthneverarrives．Aboutninetenthsofitisabsorbedbytheatmosphereoftheearth．Infact,theearthitselfgetsonlyonehalfmillionthofthesun'sentireoutputofradiantenergy．
ThesunisthesourceofallofthefollowingEXCEPT（ ）． A．gasoline
B．naturalgas
C．atomicpower
D．animalfat
参考答案：
答案解析：