单项选择题


A．why
B．what
C．that
D．because
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单项选择题
A．effectB．affectC．reflectD．perfect
A．effect
B．affect
C．reflect
D．perfect
单项选择题
Forests can provide beauty and prevent ______ . Therefore, we should spare no efforts to protect forests.
A．erosion
B．corruption
C．decay
D．spoil
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