| 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 were solved, the
railroad was established as the best means of land transportation. By 1860 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 high point in railroad building came with the construction of the first transcontinental system. In 1862 Congress authorized two western railroad compani A. limited railroad lines B. lack of a transcontinental railroad C. lack of financial support of development D. poor quality rails and unreliable stopping systems [单项选择]Over long periods of time, which of the three major asset allocation decisions account for 85 to 95 percent of returns（）
A. the asset classes to consider and which securities to choose. B. the asset classes to consider and the policy (normal) asset class weights. C. the policy (normal) asset class weights and the allowable range on those weights. [单项选择]A. One hour. B. Three hours.
C. Two hours. D. Four hours. [单项选择]"Do you want to wait""Three weeks（）too long for me to wait."
A. is B. are C. were D. was [单项选择]A) Two years. B) Three years.
C) Four years. D) Five years. [单项选择]A. Worried and frightened. B. Quite unhappy.
C. Very relaxed. D. Angry with the professor. 我来回答: 提交
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