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发布时间：2006-06-23 11:56     点击：

included an increasing variety of interpersonal crimes that are actually nonviolent.

(B) Historical accounts by monastic chroniclers in the years 1300 to 1400 are filled with descriptions of violent attacks committed by people living in the French realm

(C) The number of individual agreements between two people in which they swore oaths not to attack each other increased substantially after 1300.

(D) When English armies tried to conquer parts of France in the mid- to late 1300s. violence in the northern province of Normandy and the southwestern province of Gascony increased.

(E) The population of medical France increased substantially during the first five decades of the 1300s. Until the deadly bubonic plague decimated the population of France after 1348.

10. Rhizobium bacteria living in the roots of bean plants or other legumes produce fixed nitrogen which is one of the essential plant nutrients and which for non-legume crops, such as wheat normally must be supplied by applications of nitrogen-based fertilizer. So if biotechnology succeeds in producing wheat strains whose roots will play host to Rhizobium bacteria. The need for artificial fertilizers will be reduced.

The argument above makes which one of the following assumptions?

(A) Biotechnology should be directed toward producing plants that do not require

artificial fertilizer.

(B) Fixed nitrogen is currently the only soil nutrient that must be supplied by

artificial fertilizer for growing wheat crops.

(C) There are no naturally occurring strains of wheat or other grasses that have

Rhizobium bacteria living in their roots.

(D) Legumes are currently the only crops that produce their own supply of fixed

nitrogen.

(E) Rhizobium bacteria living in the roots of wheat would produce fixed nitrogen.

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