四级考试关于怎样准确找出文章的中心思想范文仅供参考，自行编辑使用四级考试关于怎样准确找出文章的中心思想关于标题型Example 1 :A rapid means of long-distance transportation became a necessity for the United States as settlement(新拓居地 ) spread ever farther westward. The early trains were impractical curiosities, and for a long time the railroad companies met with troublesome mechanical problems. The most serious ones were the construction of rails able to bear the load, and the development of a safe, effective stopping system. Once these
