Regular child care provided outside home or by someone other than the mother does not in itself undermine （削弱） healthy emotional connections between mothers and their 15-month-old infants（幼儿）, according to a long-term national study．The finding holds even if care begins during the first 3 months after birth and runs for 30 hours or more per week．

Among infants who receive unkind and unresponsive care from their mothers, however, the mother-care relationship may be damaged．" This research helps us put apart complexities regarding child care that have not previously been studied in detail," contends （主张） Jay Belsky, a psychologist at Pennsylvania State University．Belsky and several of his colleagues announced their findings last week at the international conference．

The investigation consists of 1,153 children and their families living in or near Boston．The youngsters, no more than 1 month old when entered the study in 1991, will be tracked until the age of 7．Experimenters gave questionnaires to mothers in their homes and videotaped baby caretaker’s interacting with the kids at ages 1, 6, and 15 months．Independent observers rated the quality of each child care efforts and noted infant nervousness．Unlike most previous studies, this one allows researchers to observe each caretaker’s personality at child nursing, and kid’s emotional reaction by the equipment．After taking family factors into consideration, other psychologists state that the researchers found no relation between the quality of child care and infant’s response．But the experimenters contend that the boys who spent more than 30 hours per week in child care exhibited more emotion for their mothers than other boys who didn’t, and the girls who spent the same hours per week in child care showed a modest （适度的） rise in this emotion．Therefore, quality of child care outside home plays an important role in the connection between mothers and infants．

55．From the first paragraph we know that _____．

     A．mother care is the best according to a national study

     B．child care outside home is the best in accordance with the study

     C．regular child care outside home may play a role as a mother

     D．connections between mothers and infants are damaged by outside care

56．According to the passage, unresponsive care from a mother may _____．

     A．ruin a kid’s growth                             B．harm the mother-child tie

     C．injure a baby’s emotional reaction             D．spoil child’s personality

57．Jay Belsky implies that the study of child care _____．

     A．was not much done in detail in the past

     B．was never carried out in the past

     C．was greatly ignored by psychologists and researchers

     D．was interesting, but very difficult to make discovery

58．The main difference between the investigation and the previous ones is that _____．

     A．the researchers started with only one month old infants

     B．the researchers could rate the quality of child care efforts and analyzed them soon

     C．the researchers were able to give the questionnaires to mothers in their homes

     D．video equipment enabled researchers to observe what was happening directly

59．The girls who received the same hours of child care outside home as the boys show _____．

     A．more emotion for their mothers                 

       B．less emotion for their mothers

     C．a modest rise in mental development           

       D．a slight decline in the personality development