bottom－living

　　creatures

　　from

　　free－floating

　　icebergs.However，large bergs can also trap sea ice，preventing its annual breakup and thus stopping phytoplankton (浮游植物) from getting life—giving sunlight，breaking the food chain at its first link.

　　Icebergs will continue to astonish and attract visitors to the polar regions.But now these frozen large masses are taking on a new dimension of wonder as we uncover their vital role in the environment of polar seas.No longer can we look at icebergs as mere passive white mountains floating in the sea.They are active agents of change，each one is an icy oasis with awake of life as it floats on its unstoppable oceanic journey to melting.

　　【语篇解读】　本文为说明文，介绍了随着全球气温不断上升，冰山数量不断增多。冰山的增多从生物、化学、物理等多个方面改变着环境，对海洋既有利也有弊。

　　46．Why does the author mention “dwarf__your__ship” in the first paragraph?

　　A．To explain how natural icebergs are.

　　B．To show how powerful icebergs are.

　　C.To describe icebergs as floating ships.

　　D．To tell the unbelievable size of icebergs.

　　答案　D　[推理判断题。根据第一段第一句Masses of floating ice are so large that they dwarf your ship，making you question...such floating mountains.可知作者是想表达冰山难以置信得大。]

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