单项选择题

A．His baby is sick.
B．He was next door the whole night.
C．He didn’’t sleep.
D．His baby cried all night.
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单项选择题
A．In the early 17th century.B．In the early 18th century.C．In the late 17th century.D．In the late 18th century.
A．In the early 17th century.
B．In the early 18th century.
C．In the late 17th century.
D．In the late 18th century.
单项选择题
A．To see how certain chemicals produce different flavors.B．To determine if a person can distinguish salty and sweet solutions.C．To map the location of taste buds.D．To count the number of taste buds.
A．To see how certain chemicals produce different flavors.
B．To determine if a person can distinguish salty and sweet solutions.
C．To map the location of taste buds.
D．To count the number of taste buds.
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