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单项选择题
A．Because the Earth is heavily polluted.B．Because nature cannot recycle its resources.C．Because there are more and more people living on the Earth.D．Because no more new resources can be added.
A．Because the Earth is heavily polluted.
B．Because nature cannot recycle its resources.
C．Because there are more and more people living on the Earth.
D．Because no more new resources can be added.
单项选择题
A．1727.B．1826.C．1839.D．1860.
A．1727.
B．1826.
C．1839.
D．1860.
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