盖玻片的厚度一般为（）？

__Life of Pi isboutn Indin boy who finds himself drifting in ________ Pcific Ocen with _______ Bengl tigerfter ________ shipwreck.the,, B．/,, the C．the,, the D．/, the,A．the,a,aB．/, a,theC．the,a,theD．/, the,a