Psychologist．
The investigation consists of 1，153 children and their families living in or near Boston．
The youngsters，no more than 1 month old when they entered the study in 1991，will be
tracked until the age of 7．Experimenters administered questionnaires to mothers in their
homes and videotaped baby caretakers 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 kids’emotional reaction by the equipment．
16．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
17．Accooding to the passage，unresponslve care from a mother may．
A、 ruin a kid’s growth
B、 harm the month-child tie
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