单项选择题

Starting as a ______campus movement, initially observed on March 21, Earth Day has become a major educational and media event.

A．student-leading
B．student-led
C．student-leaded
D．student-lead
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单项选择题
When snow collects on top of a building during the winter, the weight sometimes weakens the construction and occasionally causes the roof to collapse.
A．melts
B．accumulates
C．selects
D．scatters
单项选择题
A good employer gives hints to his or her employees without interfering with their creativity.
A．freedom
B．assistance
C．clues
D．funds
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