50．Psychologically, what does the baby monkey desire most during the first two weeks of its life?

　　A. Warmth.

　　B. Milk.

　　C. Contact.

　　D. Trust.

　　51．After the first two weeks of their life, baby monkeys prefer the cloth mother to the wire mother because the former is ________.

　　A. larger in size

　　B. closer to them

　　C. less frightening and less disturbing

　　D. more comfortable to rub against

　　52．What does the baby monkey probably gain from prolonged “contact comfort”？

　　A. Attention.

　　B. Softness.

　　C. Confidence.

　　D. Interest.

　　53．It can be inferred that when the baby monkey feels secure, ________.

　　A. it frequently rushes back for a deep embrace when exploring the toys

　　B. it spends more time screaming to get rewards

　　C. it is less attracted to the toys though they are interesting

　　D. it cares less about whether its mother is still around

　　54．The main purpose of the passage is to ________.

　　A. give the reasons for the experiment

　　B. present the findings of the experiment

　　C. introduce the method of the experiment

　　D. describe the process of the experiment

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