单项选择题

What is the author' s purpose in writing this passage

A．To call on the readers to protect homing pigeons from extinction.
B．To offer the reader information about homings pigeons and their training.
C．To appeal to the owners of homing pigeons to set the birds free.
D．To convince the reader it worthwhile to keep a homing pigeon as pet.
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单项选择题
By describing the Heritage Farm as a living museum of heirloom plants , the organization means that ______.
A．it has gathered a large collection of various plant seeds that have been handed down for generations within families as valuable objects
B．it collects jewelries and other valuable objects passed down over time within families living on the farm
C．it operates a museum of rare plants brought to America by immigrants from Europe
D．it displays a large variety of lifelike specimens of garden plants passed on within families
单项选择题
In Paragraph 4, the pronoun it refers to ______.
A．built-in radar
B．pigeon
C．a form
D．this bird' s loft
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