評(píng)論
打印
n. 需要，必需品，必然
您現(xiàn)在的位置： 首頁 > 英語四級(jí) > 英語四級(jí)閱讀 > 英語四級(jí)閱讀理解精讀附講解 > 正文
A rapid means of long-distance transportation became a necessity for the United States as settlement (新拓居地）spread over 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 were solved»the railroad was established as the best means of land transportation. By I860 there were thousands of miles of railroads crossing the eastern mountain ranges and reaching westward to the Mississippi. There were also regional southern and western lines.
The major problems with Americans railroad system in the mid 19th century lay in.
A. poor quality rails and unreliable stopping systems
B. lack of financial support for development
C. limited railroad lines
D. lack of a transcontinental railroad
| 重點(diǎn)單詞 | 查看全部解釋 | |||
| necessity | [ni'sesiti] |
想一想再看 |
||
| spread | [spred] |
想一想再看 v. 伸展，展開，傳播，散布，鋪開，涂撒 |
||
| mechanical | [mi'kænikəl] |
想一想再看 adj. 機(jī)械的，力學(xué)的，呆板的 |
||
| established | [is'tæbliʃt] |
想一想再看 adj. 已被確認(rèn)的，確定的，建立的，制定的 動(dòng)詞est |
||
| impractical | [im'præktikəl] |
想一想再看 adj. 不切實(shí)際的，不實(shí)用的 |
||
| unreliable | ['ʌnri'laiəbl] |
想一想再看 adj. 不可靠的 |
||
| quality | ['kwɔliti] |
想一想再看 n. 品質(zhì)，特質(zhì)，才能 |
||
| effective | [i'fektiv] |
想一想再看 adj. 有效的，有影響的 |
聯(lián)想記憶 | |
| construction | [kən'strʌkʃən] |
想一想再看 n. 建設(shè)，建造，結(jié)構(gòu)，構(gòu)造，建筑物 |
聯(lián)想記憶 | |
| limited | ['limitid] |
想一想再看 adj. 有限的，被限制的 |
- 閱讀本文的人還閱讀了：
可可英語官方微信(微信號(hào):ikekenet)
每天向大家推送短小精悍的英語學(xué)習(xí)資料.
添加方式1.掃描上方可可官方微信二維碼。
添加方式2.搜索微信號(hào)ikekenet添加即可。
添加方式1.掃描上方可可官方微信二維碼。
添加方式2.搜索微信號(hào)ikekenet添加即可。
