People can't jump ________ on the earth ________ on the moon．

1. A.
   so high; as
2. B.
   so high; like
3. C.
   so higher; as
4. D.
   as higher; than

He can't jump so ________ as her sister.

1. A.
   higher
2. B.
   highest
3. C.
   high
4. D.
   highly

He can't jump so ________ as her sister.

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