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

【正确答案】 A

【答案解析】解析：主旨题。根据We’ll consider what happened to this type of ant after some members of the species moveto California from their original habitat．Ok，well，in Argentina,these Argentine ants behave like most ant speciesaround 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。

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.

【正确答案】 C

【答案解析】解析：细节题。根据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．可知，住在阿根廷的阿根廷蚂蚁会与来自其他蚁巢的阿根廷蚂蚁对抗。因此，正确答案为C。

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.

【正确答案】 C

【答案解析】解析：细节题.根据But the Argentine ants living in California behave differently．Ants from different nests forma single large colony．可知，在加利福尼亚的阿根廷蚂蚁的特点是，它们会形成大群体。因此，正确答案为C。

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.

【正确答案】 A

【答案解析】解析：细节题。根据Well，using genetic testing，researchers found that all the Argentine ants in California werevery similar genetically．和all the later generations ofArgentine ants there must be descended from the same fewancestors．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。