单项选择题

Questions 22-25 are based on the following passage. What is the "lead" in a pencil made of.’

A．Diamond.
B．Carbon.
C．Lead.
D．Graphite.
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单项选择题
The advantage of the alliance lies in ______
A．its detailed travel information
B．its unique booking system
C．its longest business flights
D．its global service network
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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