题目内容

Cotton became the most profitable crop in the South mainly because of the——

A. use of irrigation on plantation
B. Whitney’s cotton gin
C. slave labour
D. improved agricultural techniques

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Gold was discovered in California in ——————

A. 1828
B. 1838
C. 1848
D. 1858

The first transcontinental railroad in the US was completed in————

A. 1850
B. 1859
C. 1869
D. 1890

The agricultural Adjustment Act was an attempt to deal with the farmers’ problem of ————

A. soil erosion
B. declining labor supply
C. inflation
D. overproduction

Choose the correct word to match the given English meaning.[ typical / trust / percent / product ]_ (n) one part of 100 (n) something that is made for sale (v) to believe someone or something_ (adj) usual, representative