甲乙两人参加一次英语口语考试！在10道题中，甲能答对6题，乙能答对8题，每次考试都从这10题中随机抽出三题进行考试！至少答对两题才算合格求甲乙两人至少有一人考试合格的概率！

 则P（A）=
C 2 6 C 1 4 + C 3 6 C 3 10=
60+20 120=
2 3，
P（B）=
C 2 8 C 1 2 + C 3 8 C 3 10=
56+56 120=
14 15；
答：甲乙两人考试合格的概率分别为
2 3和
14 15；
（Ⅱ）因为事件A、B相互独立，
所以甲、乙两人考试均不合格的概率为P（
. A•
. B）=P（
. A）•P（
. B）=（1-
2 3）（1-
14 15）=
1 45，
甲乙两人至少有一人考试合格的概率为P=1-P（
. A•
. B）=1-
1 45=
44 45；
答：甲、乙两人至少有一人考试合格的概率为
44 45．

求英语口语考试的对话 图画描写及评论

See this picture, I was shocked, looking ahead not see glaciers, replaced by a vast ocean.One is about to melt ice, sitting with a binocular helpless polar bear, alone and stare seemed to say who can help me, I'm afraid. With the melting of the Arctic ice, the polar bear has no place to go, how pathetic!However, the biggest enemy of the polar bear is human, just because their needs for human and polar bears to lose their homes only survival.Can we have not awakening it?What we do is another organism on Earth to the brink of extinction..