单项选择题

Looking at art books inspired Lee Salk to investigate _____.

A．how different artists painted Mary and Jesus in different ways
B．the way mothers hold their babies
C．the way people hold objects in times of stress
D．what effect heartbeats have on premature babies
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单项选择题
The apparently contradictory phenomenon is that _____.
A．mothers of premature babies took their babies to a follow-up clinic
B．all mothers of premature babies were seen to hold their children differently from other mothers
C．The behaviour of mothers of premature babies rejected Lee Salk's theory
D．mothers of premature babies held their babies 9n the correct side
单项选择题
The time right after birth is of great importance because it is a period when _____.
A．the baby can hear the mother's heartbeat
B．the baby produces a stimulus which the mother response to
C．the baby is separated from the mother
D．the mother's instinctive tendency to hold the baby on the left is brought out
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