2014
高考英语阅读理解抓分练习题（34）及答案 (2012•南昌市高三调研)at first, the earth's surface layer (层) was made up of huge blocks of hard, solid rocks. then slowly, these rocks broke up into smaller and smaller pieces. finally stones, pebbles (砾石) and grains of sand were formed. many sorts of plants and animals lived and died on the surface of the earth. their remains mixed up with the stones, pebbles and formed soil. the outmost layer of the earth is soil.
