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.
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单项选择题
A．1727.B．1826.C．1839.D．1860.
A．1727.
B．1826.
C．1839.
D．1860.
单项选择题
A．Less than one year.B．More than one year.C．Less than one term.D．More than one term.
A．Less than one year.
B．More than one year.
C．Less than one term.
D．More than one term.
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