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
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.
单项选择题
When the author mentions the Indian fakir, he shows that______
A．fakirs possess magic power
B．Indians are not afraid of pain
C．people can learn to cope with pain
D．some people are born without a sense of pain
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