孤独),morefamiliesarechoosingtolivetogether.”可知,由于年轻人负担不起离家的费用,而老年人又面临着被孤立的风险,越来越多的家庭选择住在一起。所以短文主要是关于英国生活方式的一种上升趋势。故选D项。DWearetheproductsofevolution,urredbillionsofyearsago.Asscientistslookdeeperintoourgenes(基因),theyarefindingexamplesofhumanevolutioninjustthepastfewthousandyears.hiopianhighlandshaveadaptedtolivingathighaltitudes.Cattle-raisingpeopleinEastAfricaandnorthernEuropehavegainedamutation(突变)thathelpsthemdigestmilkasadults.OnThursdayinanarticlepublishedinCell,ateamofresearchersreportedanewkindofadaptation-nottoairortofood,buttotheocean.Agroupofsea-dwellingpeopleinSoutheastAsiahaveevolvedintobetterdivers.TheBajau,asthesepeopleareknown,numberinthehundredsofthousandsinIndonesia,MalaysiaandthePhilippines.Theyhavetraditionallylivedonhouseboats;inrecenttimes,they’vealsobuilthousesonstilts(
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