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.

45（）

A. Sugar planters imported mongooses to control rats
B. Man should never tamper (损害) with nature
C. To upset the balance of nature can be troublesome
D. Man has complete control over nature

A. Spoken is the best way of communication.
B. Reception of communication can be achieved by our sight, hearing and touch, and these means of communication have two features in common.
C. In communication a conventional system of signs and symbols means the same to the sender and receiver.
D. The means of communication are restricted in time and space.