[单项选择]There is an abundant supply of cheap labor in this country.（　）
A. a steady
B. a plentiful
C. an extra
D. a meager

[单项选择]There is an abundant supply of cheap labor in this country.
A. a steady
B. a plentiful
C. an extra
D. a stable

[填空题]Cheap labor (scarcity was) in the cotton plantations (of the) American South, and (slaves) became (standard) practice. A. scarcity B. of the C. slaves D. standard

[填空题]Supply chain

[单项选择]In the Mediterranean seaweed is so abundant and so easily harvested that it is never （　） of great.
A. fare
B. payment
C. worth
D. expense

[单项选择]Labor is divided into how many stages
A. Two.
B. Three.
C. Four.
D. Fiv

[单项选择]

Improvements in labor productivity 56 increase wages and salaries. Wages and salaries 57 about 75 percent of all income in the United States. 58 , labor productivity is the major 59 of this (and all other) nations’ living standards. If labor productivity improves because of an advance in technology, the 60 of output increases 61 the need for additional labor. The dollar value of all goods increases 62 , which implies that consumers ultimately receive more income.
Entrepreneurs have a profit 63 to increase labor productivity. They do so by providing their workers with better equipment and creating more efficient ways for their workers to use that equipment. Entrepreneurs also have an incentive to discover new products that are more highly valued 64 to their cost of production.
Some of the largest increases in productivity occur 65 major technological advancements. The steam
A. according to
B. in view of
C. in terms of
D. because of