单项选择题


Questions 22-25 are based on the following passage.
What is in great demand in factories

A．Diamonds.
B．Diamond dust.
C．Big diamond stones.
D．Hard steel.
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单项选择题
Who was the contact man in the ABC company
A．The salesman.
B．The manager.
C．Mr. Peterson.
D．Mary.
单项选择题
What was the black walnut wood used for in World War I
A．It was used to make cabinets.
B．It was used in making cigarette filter.
C．It was used in making gun stocks.
D．It was used to make fences.
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