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英语六级

单选题

A．They share the same few ancestors.
B．They can't be distinguished from native Californian ants.
C．They are evolving faster than native Californian ants.
D．Their future survival is in doubt.

参考答案：A进入在线模考

What did genetic testing indicate about the Argentine ants in California?
细节题。根据Well，using genetic testing，researchers found that all the Argentine ants in California were very similar genetically．和all the later generations of Argentine ants there must be descended from the same few ancestors．可知，基因测试表明在加利福尼亚的阿根廷蚂蚁共有一样的少数祖先。因此，正确答案为A。

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