【正确答案】 D

【答案解析】[听力原文]
   There has been a lot of unfair and biased criticism of families who welcome foreign students into their homes. I should like to tell you of my own personal experiences, which are not so different from my neighbors' experience, I might add.
   A host family is sent students by a school or college, and their homes are regularly inspected by the accommodation staff. If a home is below the required standard, the family is removed from the school's accommodation list. Apart from this, the host family is obliged to follow certain rules, as laid down by the school.
   The problem is that the host family cannot inspect students or refuse to accept the ones who look dirty, unreliable or noisy. And they don't seem to follow any rules at all in their behavior to the host family. We are often treated like servants or hotel staff, which is rude and bad manners.
   The fee paid to a host family only just covers the actual cost of providing meals. A hostess is lucky to make more than a pound or two "profit" on each student. One has to remember that she has to allow them to have hot baths, pay for the heating in their bedrooms, and cope with damage to furniture, bedding and carpets.
   Another thing is that most of them do not want to be part of the family. They prefer to be out with other students causing annoyance to local residents in the town center. They remain in their bedrooms all morning and afternoon if they can, resting before the evening so that they can go out until the early hours of the morning.
   Bedrooms are always in a mess. Food, empty bottles and waste paper all go under the bed. Not only that, but we have to put up with their complaints about the food, the weather and even our TV programs. It's time foreign students were taught to be polite and to behave properly, as well as how to speak English!
   What is the talk mainly about?