问题: 英语改错4
1.The age of a geological sample can be
estimated from the ratio of radioactive to
nonradioactive carbon present in the object
is examined.
2.Dams vary in size from small rock barriers
to concrete structures many feet height.
3.Photographs printed in newspaper usually
have a caption underneath to explain what
they are about.
4.Overhead railway ,whose tracks are elevated out of the way of surface traffic .might have been one possible solution to heavy traffic in big citise.
解答:
.The age of a geological sample can be
estimated from the ratio of radioactive to
nonradioactive carbon present in the object
（is）TO BE examined.
2.Dams vary in size from small rock barriers
to concrete structures many feet (height) HIGH.
3.Photographs printed in newspaperS usually
have a caption underneath to explain what
they are about.
4.Overhead railwayS( ),whose tracks are elevated out of the way of surface traffic( .), (might have been) MAY BE one possible solution to heavy traffic in big CITIES (citise).
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