听力原文： Most ants are hard workers and often work from six in the morning until ten at night. The work is divided among the worker ants so that each one has a certain amount to do. We do not know how they decide what each one is to do, for they do not talk. Some people think ants follow each other by their sense of smell. Ants often live to be a year old, and some have been known to live six or seven years. One way they get their food is from plant insects which we might call their cows. The ants milk these 'cows' by tapping the insects gently until a drop of honey comes out. Then they eat the honey. Ants take very good care of these plant insects and often build a covering over them so that they will be protected from the rain. (30)