to nuclear radiation, even for a short t
问题:
to nuclear radiation, even for a short time, may produce variants(变异)of genes in human bodies. [ ]
A. Having exposed
B. Being exposed
C. Exposed
D. After being exposed
to nuclear radiation, even for a short time, may produce variants(变异)of genes in human bodies. [ ]
A. Having exposed
B. Being exposed
C. Exposed
D. After being exposed