单项选择题


Questions 22-25 are based on the following passage.
What is the most important characteristic of diamond in the modem world

A．Its decorative value.
B．Its rarity.
C．It’s the hardest mineral.
D．It’s made of carbon.
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单项选择题
At what time does the boy arrive at school according to himself
A．He is sometimes late for the class for thirty minutes.
B．For three hours.
C．Twenty five minutes late for the class.
D．Ten minutes earlier for the school.
单项选择题
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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