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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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A．He was a brave soldier.B．He took war photographs.C．He painted portraits.D．He designed a portable camera.
A．He was a brave soldier.
B．He took war photographs.
C．He painted portraits.
D．He designed a portable camera.
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