题干
A new planet has been discovered recently. It’s ______ Earth，and hopefully it can support human life.
A：almost three times the size of
B：three times the size tha
C：three times almost as large a
D：almost three times as larger a
答案(点此获取答案解析）
A
中的航速为v2，战士救人的地点A离岸边最近处O的距离为d。如战士想在最短时间
内将人送上岸，则摩托艇登陆的地点离O点的距离为