单项选择题

In the second paragraph, the author suggests that "economists" would ______.

A．consult the national commission on the economy
B．plan the economy through yearly forecasts
C．consider the influence of technological innovation important
D．value the economic contribution of farm animals
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单项选择题
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
单项选择题
The main difference between the investigation and the previous ones is that ______.
A．the researchers started with only one month old infants
B．the observers 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
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