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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What is this discussion mainly about？
A. Success in college
B. How to read faster
C. Academic study skills
D. Research on college students
What would the professor probably like the students to do？
A. Spend more time studying outside of class
B. Use their dictionaries when they are reading
C. Take one of her classes at the college
D. Get help at the Learning Center
According to Paragraph 4, what is the function of the Jacobson's organ in snakes？
A. To assist in the search for chemical particles in the air.
B. To enable the tongue's fork to be spread more widely.
C. To utilize the snake's trained sense of direction.
D. To compare the sensory input of the two tongue tips.
The word pronounced in the passage is closest in meaning to
A. controlled.
B. obvious.
C. evolved.
D. useful.
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