假设P为债券价格，F为面值，C为票面收益，r为到期收益率，n是债券期限，如果按年复利计算，零息债券到期收益率为()。
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We learn from the text that an ostrich can go a long distance at high speed as
A. it is a special kind of bird
B. it lives in large desert areas
C. it has special wings and legs
D. it is the largest bird in the world
Who does the author say tend to identify themselves with the characters in games？
A. Teenage girls．
B. Older woman．
C. Men in their 20s．
D. Men 50 and older．
The female switch identifies her own eggs by their size and______.
A. color
B. number
C. shape
D. weight
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