Aswan High DamThe Aswan High Dam, Aswān, Egypt, an earthfill dam. Compared with concrete, soils and rock fragments lack strength, are much more permeable, and possess less resistance to deterioration and disturbance by flowing water. These disadvantages are compensated for by a much lower cost...
一、审 题 这是写作文首先要做好的事，否则，就会直接导致“文不对题”，“下笔千言，离题万里”。怎样才能审好题呢？根据通常的作文题目的形式来看，一般可分为命题作文和材料作文两大类。对命题作文的审题，就是要审查给定的文章题目确定的具体要求，审清文题意图，明晰题外要求，确定“题眼”。...