单项选择题

A．How to drop a course.
B．The man needs advice about which classes to take.
C．How to get the approval of the professor.
D．How to add a course to the man’s schedule.
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单项选择题
A．The purpose of laughter.B．The cause of laughter and its effects.C．Who and when people laugh.D．The origins of laughter.
A．The purpose of laughter.
B．The cause of laughter and its effects.
C．Who and when people laugh.
D．The origins of laughter.
填空题
As we are still ignorant of millions of unique life forms in the rainforest, deforestation can be compared to the destruction of ______.
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