资料：Ahigh-precisionNASAradarinstrumentleftaNASAairportinSouthernCaliforniaforIcelandonJanuary28tocreatedetailedmapsofhowglaciersmoveinthedeadofwinter.Thiswillhelpscientistsaroundtheworldbetterunderstandsomeofthemostbasicprocessesinvolvedinmeltingglaciers,whicharemajorcontributorstorisingsealevels. NASAusedthesameairborneinstrumentinJune2012tomapthesummerflowsoftwoIcelandicicecaps.Theicecaps—largeareasofpermanentsnowandicecover—encompassmultipleglaciersflowingindifferentdirectionsandatdifferentspeeds.Bymappingthesameicecapsnow,inwinter,whenthesurfaceremainsfrozenallday,andthencomparingthewinterandsummervelocities,theresearcherswillbeabletoisolatetheeffectsofmeltwater. AboveisaviewofasmallpartoftheHofsjkullicecap,whichencompassesseveralglaciers.ThefanatupperleftispartofaglaciercalledMlaj?kull. Formoreontheresearch,seethisNASApressrelease. WhatisthemissionoftheNASAradarinstrument?
A.To investigate the climate change. B.To make maps about moving glaciers. C.To measure the rising sea levels. D.To slow the melting process of glaciers正确答案B
