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单选题
A farmer imported several fine long wool Tomney sheep from Australia to breed with his Debouittet sheep in hopes of increasing the value of the flock’s wool. This is an example of ______.
A

pure-breeding

B

crossbreeding

C

reproducing

D

cloning


参考答案

参考解析
解析:
题干中描述到一位农民从澳大利亚进口了几只拥有优良长毛的Tomney sheep,然后让它们与他的Debouittet sheep进行繁殖,希望来增加羊群的羊毛价值,根据上题解析可知这属于crossbreeding(杂交)。
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