I could just see a car in the distance, but I couldn’t _____ what color it was.

A．look out

B．get across

C．make out

D．take after

磺基水杨酸比色法测定葡萄酒中铁含量时，加人过量的磺基水杨酸溶液是为了消除铜离子的干扰。