单项选择题
The sun heats the earth,（）makes it possible for plants to grow.
A．that
B．where
C．which
D．what
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Students buying a car should take into account（）
A．the interest of the loan
B．insurance costs
C．the age of the car
D．the family objections -
单项选择题
Just as people differ in their ability to hear sound, （） differ in their appreciation of sounds.
A．so also do they
B．so they also do
C．also so do they
D．so do they also -
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Seldom（）any mistake during his past ten years of service there.
A．did he make
B．he made
C．he makes
D．he did make
