  Q$^2$ variation of the nuclear-structure-function ratio
$F_2^A(x,Q^2)/F_2^D(x,Q^2)$ is investigated in a parton model with
Q$^2$-rescaling and parton-recombination effects. Calculated results are
compared with the NMC (New Muon Collaboration) and the Fermilab-E665
experimental data. We find that our theoretical results show small Q$^2$
variations and that they are consistent with the data within present
experimental accuracy.
