A.Her father was once helped by others.

　　B.Her father liked to help beggars.

　　C.She was once a beggar herself.

　　D.Her mother taught her to help beggars.

　　解析：根据最后一段母亲的话可知，她的父亲在大萧条时期曾受到过别人的善待，作为回报，她也善待乞丐。

　　答案：A

　　B

　　Researchers believe that the insect is better at managing congestion(拥挤) than humans.Ants are the most numerous type of animal on Earth with brains that contain about 250,000 cells—the largest among insects.

　　Now collective intelligence expert Dr.Dirk Helbing says understanding more about ants could help solve one of the headaches of modern life—road congestion.

　　His team set up an “ant motorway” with two routes of different widths from the nest to some sugar syrup (糖浆).Soon the narrower route became congested.But when an ant returning along the congested route to the nest collided with another ant just starting out，the returning ant pushed the newcomer onto the other path.However，if the returning ant had enjoyed a trouble­free journey it did not redirect the newcomer.

　　The result was that just before the shortest route became clogged the ants were diverted (转移) to another route and traffic jams never formed.

　　The researchers also created a computer model of more complex ant networks with routes of different lengths.The team found that even though ants being rerouted sometimes took a longer route，they still got to the food quickly and efficiently.

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