A new study proves a ________ walk every day is enough to keep people away from becoming fat．

1. A.
   30-minute
2. B.
   30 minutes'
3. C.
   30-minutes
4. D.
   30 minute's

A new study proves a ________walk every day is enough to keep people away from becoming fat．

A．30 minute         B．30 minute’s         C．30 minutes

A new study proves(证明) a        walk every day is enough to keep people away from fat.

1. A.
   30-minute
2. B.
   30 minute’s
3. C.
   30-minutes
4. D.
   30 minutes’s

—A new study proves(证明) a        walk every day is enough to keep people away from fat.