单项选择题

The experiment on the dental patients holding a rubber ball was to see _____.

A．if the ball would help them overcome their stress
B．if the ball would interfere with the dentist's activities
C．if the ball would help the dentist's treatment on them
D．on which side they held it.
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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
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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