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            • 1． It’s reported that China’s grain production accounts for a fourth of the world’s total output, _____ population for a fifth.

                 

              A．of which
              B．its
              C．and its
              D．which
              难度：难
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            • 2．

              Does the English teacher tolerate          their homework late very often?

              A．the pupils to turn in
              B．the pupils’turning in
              C．the pupils hand in
              D．the pupil handed in
              难度：难
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