单项选择题

Those experiments have laid a solid foundation for his（）research in material science。

A．far
B．deep
C．farther
D．further

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单项选择题
As she entered the room she could see big bright lights hung from the（）

A．roof
B．top
C．ceiling
D．height
单项选择题
Stephen Bullon is the only man in the village（）today that has survived the war。

A．live
B．lived
C．alive
D．active
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