36 ………………..
will not be encouraged through buying and selling
alone. Richardson believes that the
37 ………………..
needs to be withdrawn, as the
U.S. provides most of the world’s helium. He argues that higher costs would mean
people have
38 ………………..
to use the resource many times over.
People should need a
39 ………………..
to access helium that we still have.
Furthermore, a
40 ………………..
should ensure that helium is used carefully.
© The British Council 2012. All rights reserved.
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