import – How to close the warning `precision can be lost`?

When I import data from .dat The shows 11.3 is too small to represent a standardized computer number; accuracy can be lost.
How can I close the display or replace it? number with 0.? Here is my code
Readlist[OpenRead["C:\Users\px\Desktop\1.DAT"], Real] I know Import will not show this warning, but the speed is slow.