单项选择题

A．It is a rare phenomenon.
B．It changes useless land into productive land.
C．It changes cropland into desert.
D．It helps farmers remove fertile topsoil.
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单项选择题
A．Affection and politeness.B．Situations and intimacy.C．Attitudes and relationships.D．Emotions and behavior.
A．Affection and politeness.
B．Situations and intimacy.
C．Attitudes and relationships.
D．Emotions and behavior.
单项选择题
A．Patrolling the streets.B．Doing undercover work.C．Doing detective work.D．Supervising investigations.
A．Patrolling the streets.
B．Doing undercover work.
C．Doing detective work.
D．Supervising investigations.
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