[单项选择]Greater efforts to increase agricultural production must be made if food shortage （） avoided.
A. is to be
B. can be
C. will be
D. has been

[单项选择]Great efforts to increase wheat production must be made if bread shortages ______ avoided.
A. will be
B. can be
C. are to be
D. were to be

[单项选择]He is assigned to {{U}}oversee{{/U}} the production of the assembly lines.
A. supervise
B. watch
C. suspect
D. predict

[单项选择]The Agricultural Adjustment Act encouraged American farmers to ______.
A. reduce their scale of production
B. make full use of their land
C. adjust the prices of their farm products
D. be self-sufficient in agricultural production

[单项选择]

Passage Five
The agricultural revolution in the nineteenth century involved two things: the invention of labor-saving machinery and the development of scientific agriculture. Labor-saving machinery naturally appeared first where labor was scarce. "In Europe", said Thomas Jefferson," the object is to make the most of their land, labor being abundant; here it is to make the most of our labor, land being abundant." It was in America, therefore, that the great advances in nineteenth-century agricultural machinery first came. At the opening of the century, with the exception of a crude plow, farmers could have carried practically all of the existing agricultural implements (农具) on their backs; by 1860,most of the machinery in use today had been designed in an early form. The most important of the early inventions was the iron plow. As early as 1790 Charles New-bold of New Jersey had been working on the idea of a cast-iron plow and spent his en
A. The need for agricultural advances to help feed a growing population.
B. The development of safer machines demanded by the labor movement.
C. Machinery that contributed to the agricultural revolution.
D. New Jersey as a leader in the agricultural revolution.