澳大利亚至今保存着考拉、鸭嘴兽等古老动物的主要原因是（ ）
A：地形以平原和高原为主
B：长期孤立在南半球的海洋上
C：大盆地有丰富的地下水
D：气候干燥，有大面积的沙漠
Young Club ____(found) two years ago to provide training for students and unemployed young adults aged 18 to 21.
— Will you please give the dictionary to Jane?
— Sure, I'll give it to her ____ she arrives here.
