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
From the last paragraph we can infer that ______.
A．unlike big seed companies, Seed Savers Exchange do not sell seeds to people
B．Seed Savers want to prevent large-scale spreading of disease among plants by breeding new types of plants
C．growing limited types of plants may endanger our food supply, because large scale spreading of disease is more likely to occur
D．big seeds companies try to protect food supply by breeding hybrid plants
单项选择题
The word biodiversity in the last paragraph means ______.
A．searching different sources of food supplies throughout the world
B．collecting various plant seeds, like vegetables, fruits, grains, flowers and herbs
C．the existence of a large variety of rare plants and animals in a given place at a given time
D．the existence of a wide range of different types of plants and animals in a given place at a given time
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