  Two important initial-state nuclear effects in hadron-nucleus collisions are
considered. The ratios of inclusive differential cross sections for Drell-Yan
dimuon production are calculated. The calculated results are compared to the
E866 data. It is shown that consideration of multiple soft rescatterings of
incident quarks in nuclei and initial-state quark energy loss effects allow to
get a good agreement between the calculated results and the experimental data.
