题目内容

剖切符号的转折处不允许与轮廓线重合。( )

A. 对
B. 错

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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

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

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