The problem of names and faces was put to an experimental test in people to be studied in

1934 by an American scientist, H.M. Clarke. He showed his subjects (试验对象)a page containing photographs of the faces of twelve men and, under each photograph, there was a name. The subjects had three minutes in which to study these names and faces by whatever method they would usually use in learning the names of real people. Three minutes later, remembering was tested in four different ways. The original names had to be recognized when mixed up with a number of "new" names; the original faces had to recognize from "new" faces; the original faces were shown and the suitable names had to be recalled; and the original names were shown and the corresponding(相对应的) faces recalled. Nearly 500 college students acted as subjects in this experiment and the results were clear. It was easier to recall recognize names than to them, but it was as easy to recognize names as to recognize faces. If either names or faces were recalled, the remembering performance was not as good as the involving recognition. Thus, from the examples given above, the difference between recalling and recognition should be clear.

What the American scientist did was to test ________.

A．recognition

B．remembering

C．the ability of people to learn the names

D．the ability of people to recognize faces