  The quasiparticle excitation spectrum of a type-II superconductor placed in
high magnetic field is shown to be gapless. The gap turns to zero at the points
in the MBZ which are in correspondence with the vortex lattice in real space.
When the field decreases below certain critical value, branch crossing occur
and gaps starts opening up at the Fermi surface.The strong dispersion around
gapless points leads to algebraic temperature dependence in the thermodynamic
functions and the algebraic voltage dependence in the tunneling conductance
between the microscope tip and superconductor in an STM experiment.
