阅读理解13(共20小题；每小题2分，满分40分)

阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

A

My son and I were trying to sell the house we had repaired but in the barn(谷仓)there were bats(蝙蝠)and they would not leave. The barn was their home. They told us so in their own way. They hung there in the barn and seemed determined to stay for the season. Don't worry about it, Dad, " Patrick said. They keep down the mosquitoes(蚊子).”

Unfortunately they also kept the buyers away. when we had asked a person to sell　the house for us he had refused to show it because of the bats. Bats are popular, "Patrick comforted me. They're ecological(生态学的)."Isn't there a machine you can buy that produces high?frequency sounds to keep bats away?” I don't know,” said Patrick. But I like bats, and whoever buys this house will probably like them too."”Probably?"I hated that word. How many bats are　there ,anyway?" I counted about 90 last night," said Patrick. They were dropping out from under the edge of the roof." You mean there are more—outside?" They're everywhere, Dad. But look at it this way. When the cold weather comes, they’ll be off to Mexico. Maybe in the spring we can keep them out. Don't worry about it,” he said for the hundredth time. It's not a problem."