小题1:A
小题2:D
小题3:C
小题4:D
小题5:B
小题1:根据第二段第一句During the first two weeks of its warmth is perhaps the most important psychological（心理的） thing that a monkey mother has to give to its baby.可以直接判断出选A。
小题2:根据第二段最后一句Thereafter they switched and spent most of their time on the more comfortable cloth mother.可知选D。
小题3:根据第三段最后一句Wire doesn’t“rub”as well as does soft wire cloth. Prolonged（长时间的）“contact comfort” with a cloth mother appears to give the babies confidence and is much more rewarding to them than is either warmth or milk.可知选C。
小题4:根据第四段最后两句可知应选D。
小题5:推断作者的写作意图。纵观全文，全文只是介绍了对小猴的心理实验的实验结果。故选Ｂ。