In July 2017, the researchers disturbed part of the ant nest in search of larvae (幼虫), empty cocoons (茧), and queens. They found nothing, leading them to suspect that the lack of food and cold temperatures made reproduction impossible and that the group tending the nest is entirely made up of non-reproductive female workers. Their population is refilled every year, by a new rain of unfortunate ants that slide down the hole. The researchers say that when they returned in January 2016, the nest had been repaired. It appears that despite the terrible conditions, the worker ants do not stop constructing their nest.

　　Wood ants are known for their ability to adapt to bad living conditions. In this case, the millions of worker ants trapped in the storehouse have no choice. But instead of losing hope, they are making the best of the situation — a classic example of “when life gives you lemons, make lemonade.”

　　28. How did the wood ants arrive in the storehouse?

　　A. They fell down there by accident.

　　B. The research team brought them there.

　　C. The storehouse builders left them there.

　　D. They were attracted by the environment.

　　29. What does the underlined word “eroded” in Paragraph 2 probably mean?

　　A. melted.

　　B. rotted.

　　C. exploded.

　　D. expanded.

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