题目

任务型阅读。    It was Mother’s Day, but the young mother was a little unhappy, because she was 800 miles away from her parents. In the morning she phoned her mother to wish her a happy Mother’s Day, and her mother told her about the beautiful lilacs（丁香）in the garden.   Later that day, when she told her husband about the lilacs, he said, I know where we can find all that you want. Get the children and come on.” So they went, driving down the country roads.   There on a small hill, they saw a lot of beautiful purple lilacs. The young woman ran quickly to enjoy t19．青藏高原的形成是由于（　　）A．亚欧板块与印度洋板块碰撞B．亚欧板块与太平洋板块碰撞C．亚欧板块与印度洋板块张裂D．亚欧板块与太平洋板块张裂