单项选择题

A．Their neighbors.
B．Their children.
C．Their schoolmates.
D．Their parents.
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单项选择题
A．He is satisfied with driving from his home to work.B．The distance is about 20 miles.C．The road is good but there’s a lot of traffic.D．He lives very far from his work.
A．He is satisfied with driving from his home to work.
B．The distance is about 20 miles.
C．The road is good but there’s a lot of traffic.
D．He lives very far from his work.
单项选择题
It is implied that the main difference between S and R rats is their ______.
A．need for Sodium 22
B．rate of mating
C．reaction to salt
D．type of blood
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