单项选择题


Questions 18-21 are based on the following passage.
Which of the following is true in describing the black walnut tree

A．The black walnut tree is valued for its nuts.
B．The black walnut tree is famous for its size.
C．Every walnut tree is highly valuable and profitable.
D．A single black walnut tree was once sold for $11,000.
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单项选择题
We can learn from the last paragraph that One-world______
A．offers the lowest prices to its passengers
B．keeps passengers better informed of its operations
C．offers better services than any of its member airlines alone
D．is intended to make round-the-world trips more Challenging
单项选择题
What is the lead in a pencil made of.’
A．Diamond.
B．Carbon.
C．Lead.
D．Graphite.
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