甲施工单位向乙预制件厂订制非标购件，合同约定乙收到支票之日三日内发货，后甲顾虑乙经营
题型：单项选择题
问题：
甲施工单位向乙预制件厂订制非标购件，合同约定乙收到支票之日三日内发货，后甲顾虑乙经营状况严重恶化，遂要求其先行发货，乙表示拒绝。则乙的行为（）
A.违约行为
B.行使同时履行抗辩权
C.行使先履行抗辩权
D.行使不安抗辩权
题型：单项选择题
第二部分阅读（共20小题，每题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或D）中，选出最佳选项，并在答题卡上将该项涂黑。
A
An old friend from California called from the airport（机场） to tell me that he had arrived. I was not able to leave the office, but I had made plans for his arrival. After explaining where my new house was, I told him that I had left the key under the doormat (门垫). Since I knew it would be pretty late before I could get home, I suggested that he make himself at home and help himself to anything that was in the refrigerator.
Two hours later my friend phoned me from the house. At the moment, he said, he was listening to some of my records after having had a delicious meal. Now, he said, he was drinking a glass of orang
e juice. When I asked him if he had had any difficulty finding the house, he answered that the only problem was that he had not been able to find the key under the doormat(门垫), but luckily, the living room window by the apple tree had been left open and he had climbed in through the window. I listened to all this in great surprise. There is no apple tree outside my window, but there is one by the living room window of my next door neighbor's house!
31. An old friend of mine called ______.
A. to tell me to meet him at the airport B. to tell me about his arrival
C. to ask me to leave the office D. to ask me to make plans for his arrival.
32. My friend climbed into the room because ______ .
A. there was an apple tree outside B. the living room window was left open
C. he had difficulty opening the door D. he hadn't found the key
33. My friend telephoned me two hours later ______ .
A. from my home B. at the airport C. in his office D. from my neighbor's house
34. The purpose（目的） of writing this passage（文章的段） is to ________.
A. introduce a friend B. tell an interesting story
C. explain something D. show what friendship is