分页标题
2011-09-02 17:15:00   来源：网络资源    双击单词自动翻译

　　The　ice　on　the　front　windshield　of　the　car　had　formed　when　moisture　condensed　during　the　night.　The　ice　melted　quickly　after　the　car　was　warmed　up　the　next　morning　because　the　defrosting　vent,　which　blows　only　on　the　front　windshield,　was　turned　on　full　force. Which　of　the　following,　if　true,　most　seriously　jeopardizes　the　validity　of　the　explanation　for　the　speed　with　which　the　ice　melted?