—He's a ________ in our company, treating his members kindly.

    After lunch, without permission from parents, the two boys set off to explore the part of the beach which lay beyond the headland(陆岬). They had persuaded their young sister to 1 saying that the long walk would be too 2 for her. Once they had got in the headland, the beach reached away endlessly before them. It was like 3 a new world. There were damp, dark caves to 4 there were many 5 among the rocks, full of sea lives. Here and there along the beach were those 6objects, washed up and 7by the tide.(潮汐)

    The afternoon passed 8The sun was already 9 when the boys reluctantly (恋恋不舍)10to make their 11 homewards. But long before they reached the headland, they could see that tide had come in so sudden that they were now 12from either end of the beach. Their only chance of 13was to find a way up the cliff(悬崖) nearby.

    They soon find a narrow path 14the cliff top. But half way up their path was15by a large rock which they could not climb 16. The two boys had to17at the top of their voices,18 that someone might19over the top of the rock. Finally came their father and two policemen.20 of them climbed down a rope which was lowered over the rock. The boys were then pulled to safety, and thus saved from spending a terrible night on the cliff.

由中国承建的帕德玛大桥是孟加拉跨越恒河的公路铁路两用桥。该桥在世界同类桥梁中基础施工难度最大。桥梁基础部分将采用斜桩施工，每个钢桩重量达500吨，钢管壁厚60毫米，共240根。为了把这幺重的钢桩倾斜打八120米深的地下，专门制造了世界上最大的造价接近l亿的液压锤。帕德玛大桥主桥上部结构为跨度150米的钢桁梁——预应力混凝土桥面板组合结构连续渠．帕德玛大桥施工难度大，主要是由于该地(    )