单项选择题

Questions 11--13 are based on the following passage. You now have 15 seconds to read Questions 11--13. Which is not mentioned in the passage as an aspect that farming activities are damaging

A．Soil.
B．Human population.
C．Forests.
D．Water Supplies.
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单项选择题
A．overB．onC．underD．behind
A．over
B．on
C．under
D．behind
单项选择题
Before the change, Harvard ______.
A．was short of financial aid
B．offered a narrower range of subjects
C．was not strict with its students
D．All of the above.
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