题目

As most of their houses were badly damaged after the earthquake, many people had to be________in a stadium.        A.put away  B.put up      C.put out     D.put off 答案:B自古以来,钓鱼岛及其附属岛屿都是我国固有领土。如图,为了开发利用海洋资源,我勘测飞机测量钓鱼岛附属岛屿之一的北小岛(又称为鸟岛)两侧端点A、B的距离,飞机在距海平面垂直高度为100米的点C处测得端点A的俯角为60°,然后沿着平行于AB的方向水平飞行了800米,在点D测得端点B的俯角为45°,求北小岛两侧端点A、B的距离.(结果精确到0.1米,参考数据)
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