单项选择题


Questions 18-21 are based on the following passage.
Why is the black walnut tree so valuable7

A．Because of its hardwood and its beauty.
B．Because of its historic value.
C．Because of its great age.
D．Because of its great size.
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单项选择题
One-world in the passage refers to______
A．a travel agency
B．a union of airlines
C．a series of tourist attractions
D．the title of a flight program
单项选择题
The human body has developed a system of nerves that enables us to______
A．stay relaxed
B．avoid pain
C．stand torture
D．feel pain
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