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 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
单项选择题
Salk's experiments proved that _____.
A．mothers have an instinct to hold their babies on the left immediately after birth
B．mothers find it more comfortable to carry their babies on the left
C．mothers tend to hold their babies on the left at times of stress
D．mothers of premature babies have no instinct to hold their babies on the left
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