Nature changed our environment over the years．,We must -找考题网

单项选择题

A．Nature changed our environment over the years.
B．We must avoid wasting resources and polluting our environment.
C．Our resources are nearly used up.
D．Trips to other planets will help eliminate pollution.

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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．About 80 miles per second.B．About 70 miles per second.C．About 18 miles per second.D．About 17 miler per second.

A．About 80 miles per second.
B．About 70 miles per second.
C．About 18 miles per second.
D．About 17 miler per second.

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