【单选题】

The advantages of ’’an after the act’’ operation is:(31)____________(32)____________(33)_____________easilyOnly (34)____________of large firms and (35) _____________of small firms have a standard raw material inspection procedure.This testing of a product’’s effect must assess the impact of both ( 36 ) ____________and (37) ____________.

A、have a set of standards which adhere to national requirements.
B．have adopted standards in line with SA
A、
C．represent some ofAustralia’’s major exporters.