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单选题

A．How they behave toward ants from other nests.
B．What they usually eat.
C．Why they are becoming extinct.
D．Why they were brought to California

参考答案A

解析:Today, we are going to continue our discussion of social insects, focusing on the Argentineant, which as you might guess is a species of ant that are natives to Argentina. We' 11 consider what happened to this type of ant after some members of the species move to California from their original habitat. Ok, well, in Argentina, these Argentine ants behave like most ant species around the world. They fight other ants of the same species if those ants are from some other nests. But the Argentine ants living in California behave differently. Ants from different nests form a single large colony. Within this colony, there is little aggression among ants from different nests. And when they fight insects from outside their colony, the Argentine ants can quickly recruit a huge army from their network of nests. This of course gives them advantages over other ants' species. So then, why do Argentine ants behave differently in California than they do in Argentina? Well, using genetic testing, researchers found that all the Argentine ants in California were very similar genetically. You see, when the first Argentine ants came to California, their population must have been very small, and all the later generations of Argentine ants there must bedescended from the same few ancestors. So they are all closely related. This discovery is important, because for most social insects, membership in a colony is based on how closely related they are genetically.
What aspect of Argentine ant is mainly discussed?
主旨题。根据We’ll consider what happened to this type of ant after some members of the species move to California from their original habitat．Ok，well，in Argentina，these Argentine ants behave like most ant species around the world．和讲座全部内容可知。主要讨论了阿根廷蚂蚁对来自其他蚁巢的蚂蚁是如何表现的。因此，正确答案为A。

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单选题

A．They protect Argentine ants that live in neighboring nests.
B．They gather food with Argentine ants from other nests.
C．They fight Argentine ants from other nests.
D．They generally build larger nests than other ant species do.

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单选题

A．They attack members of their own nests.
B．They recruit ants from other species into their nests.
C．They form large colonies made of several nests.
D．They hide from insects that attack their nests.

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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.

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