  The inclusive single and double differential cross-sections for neutral and
charged current processes with four-momentum transfer squared Q^2 between 150
and 30,000 GeV2 and with Bjorken x between 0.0032 and 0.65 are measured in e^+
p collisions. The data were taken with the H1 detector at HERA between 1994 and
1997, and they correspond to an integrated luminosity of 35.6 pb^-1. The Q^2
evolution of the parton densities of the proton is tested, yielding no
significant deviation from the prediction of perturbative QCD. The proton
structure function F_2(x,Q^2) is determined. An extraction of the u and d quark
distributions at high x is presented. At high Q^2 electroweak effects of the
heavy bosons Z0 and W are observed and found to be consistent with Standard
Model expectation.
