The word modification in the passage is closest in meaning to
A. adjustment.
B. invention.
C. growth.
D. condition.
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What can be inferred from Paragraph 5 about plow animals？
A. Their use was mandated under the system of Manorialism.
B. They can pull more weight with their chests than with their necks.
C. They were replaced by new technologies in the eleventh century.
D. Humans began to utilize them around 900 ＣＥ.
The word snaring in the passage is closest in meaning to
A. testing.
B. keeping.
C. forming.
D. catching.
According to Paragraph 3, how do the senses of snakes differ from those of humans？
A. Snakes use their nostrils and nasal cavities when smelling.
B. Snakes have less developed hearing abilities than humans.
C. Snakes' eyesight is better at night than during the day.
D. Snakes' sensitivity to heat is less than that of humans.
In Paragraph 3, the author explains the importance of the switch to the three-field system
A. discussing the role of crop variety in a healthy diet.
B. describing how it began a process of further agricultural improvement.
C. illustrating the division of farmland it prescribed.
D. comparing the amount of work it required to that under the two-field system.
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