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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