41.D 全文的中心写的是小岛和岛上生命形成过程.
42.A Sea waves dashed against the rock.In this way,soil and sand came into being.
43.D 二者都有裸露的意思
44.A Nothing lived on the naked soil.And then the wind and birds brought plant seeds,spiders and other little creatures there.
45.C A spider spun its web in vain,because there were no insects for its web to catch.