单选题 .  One of the world's oldest and most famous statues may not     1    much longer unless steps are     2    to save it. The huge forty-five     3    years old statue     4    as the Sphinx is     5    Egypt's greatest national treasures. The statue of a lion's body with a human head is     6    the great Pyramids of Egypt, west of Carlo. During the     7    years the Sphinx has     8    , wind and sand have     9    deep cuts in the sides of the huge statue and there are     10    through its body. The first     11    to fix the statue was made     12    thirty-four hundred years     13    . And there is     14    of many more attempts to repair the     15    of wind and time. Scientists say the Sphinx now is     16    from something very similar     17    cancer in humans. An American scientist says that salt is the cancer,     18    was used to     19    the Sphinx in the past. When the stone is wet, the large amount of salt in the statue     20    .1.