D．spoil a child’s personalty
18．Jay Belsky implies that the study of child care．
A．was never carried out in the past
B．was not much done in detail in the past
C．was greatly ignored by psychologists and researchers
D．was interesting，but very difficult to make discovery
19．The main difference between the investigation and the previous ones is that．
A．the researchers7C stared with only one month old infants
B．the observers could rate the quality of child care effofts and analyzed them soon
C．the researchers weft able to give the questionnaires to mothers in their homes
D．video equipment enabled researchers to observe what was happening direct
20．Which of the following is not TRUE of the investigation?
A．It Will last at least 7 years．
B．Cooperation from the mothers is also necessary.
C．some independent observers play a part．
D．
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