单项选择题

A．Never continually planting crops at the same place.
B．Letting animals feed on the same lands year after year.
C．Planting trees around cropland yearly.
D．Searching for every possible method to avoid desertification.
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单项选择题
A．The fear of the unknown stresses him out.B．He has to walk from moment to moment.C．He feels bored when patrolling at night.D．He must insure the security and safety of citizens.
A．The fear of the unknown stresses him out.
B．He has to walk from moment to moment.
C．He feels bored when patrolling at night.
D．He must insure the security and safety of citizens.
单项选择题
A．It follows a universal pattern.B．It varies among individuals and cultures.C．It changes from countries to countries.D．It depends on moods.
A．It follows a universal pattern.
B．It varies among individuals and cultures.
C．It changes from countries to countries.
D．It depends on moods.
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