A.50                                   B.2                                C.1+lg5                    D.1

A.50             B.2                 C.1+lg5           D.1

设x、y是满足2x+y=20的正数，则lgx+lgy的最大值是

1. A.
   50
2. B.
   2
3. C.
   1+lg5
4. D.
   1