题目

阅读下面短文，从各题所给的A、B、C、D四个选项中，选出最佳选项。 An old friend telephoned from the airport to tell me that he had arrived. I was still in the office at that time but I had got 1 ready for him to stay with me. I 2 him where my house was. I also told him that I had left the key under the doormat (门垫). As I was going 3 late, I asked him to go into the kitchen 4 get something to eat and drink. Two hours 5 my friend telephoned me from the house. At the moment, he said, he was 6 the music. He said he helped 7 to some cold chicken from the fridge 腔肠动物也能生活在水中，它的______简单，有______无______．