单项选择题

Allthe cars are tested for defects before leaving the factory（）

A．functions
B．faults
C．motions
D．parts

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单项选择题

These programmes are of immense value to old people（）

A．natural
B．fatal
C．tiny
D．enormous

单项选择题

Many scientists have been probing psychological problems．（）

A．solving
B．exploring
C．settling
D．handling

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