After 20 years of marriage, a husband may still not understand his wife. How is it that she is never at a (41) for words How can she (42) the names of a couple they met on (43) years ago Now we know (44) to tell him: it’s her brain.

44（）

A. The spoken language is the most highly developed form of auditory communication.
B. Normally, the act of communication requires the presence of at least three persons.
C. The means of communication mentioned in the passage last only for a moment.
D. Fire, smoke, flags and flashing lights can all be signals of visual communication.

A. Color probably has an effect on us which we are not conscious of.
B. Yellow fire engines have caused many bad accidents in some advanced communities.
C. People exposed to pure blue start to breathe more slowly.
D. The psychology of color is of some practical use.