题目

Scotland has long been characterized as a land of romance.It contains ruins of many ancient castles and abbeys，and there is an attractive beauty in its mountains，long deep valleys，and ribbon lakes.Each year those things attract a great number of tourists. Numerous islands line the coast.In the north are two large groups，the Orkney Islands and the Shetland Islands.Close to the west coast are the Inner and Outer Hebrides groups，and the islands of Arran and Bute. The land may be divided into three regions: the Highlands in the north，the Central Lowlands and the Southern Uplan如图，已知△ABC的顶点B的坐标是（2，1），将△ABC向左平移两个单位后，点B平移到B1，则B1的坐标是 [     ]A．（4，1）B．（0，1）C．（-1，1）D．（1，0）