我国铁路每公里线路上铺设的轨枕数量，一般在1520～1840根。（）。

A:500根左右 B:1520～1840根 C:3000根左右 D:5000根左右

1840年以后，从皇帝到权贵，大都（）。

A:昏庸愚昧 B:不了解世界大势 C:不懂得御敌之策 D:害怕人民群众

1840年以前，中国城市的主要功能（）。

A:政治功能占主导地位 B:军事功能占主导地位 C:文化功能占主导地位 D:经济功能依附于政治、军事功能 E:文化功能依附于政治、军事功能

1840年后中国最早开放的城市是（）。

A:上海 B:宁波 C:福州 D:广州 E:南京

The aim of voyages Maury encouraged in the 1840s was（　）

A:to estimate the length of cable that was to be made B:to make some sound experiments in the oceans C:to measure the depths of two oceans D:to collect samples of sea plants animals

The ______ of finding gold in California were good in the 1840's.

A:proposals B:promises C:prospects D:privileges

The aim of voyages Maury encouraged in the 1840s was ______. ( )

A:to make some sound experiments in the oceans B:to collect samples of sea plants animals C:to estimate the length of cable that was to be made D:to measure the depths of two oceans

The aim of voyages Maury encouraged in the 1840s was ______.

A:to make some sound experiments in the oceans B:to collect samples of sea plants and animals C:to estimate the length of cable that was to be made D:to measure the depths of two oceans