痰的主要成分是尘粒、细菌和粘液组成，形成的部位是咽部．______．

完形填空(共10分)
　　根据短文内容，从A、B、C、D 四个选项中选出一个最佳答案。(共10分，每小题1分)
　　Mr. Green works in an office in Chicago 21 Saturday, he went to the office to some work. When he got on the elevator, it stopped between the 22 .Mr. Green could not get out of the elevator. He started to 23 , but no one 24 him. Then Mr. Green remembered that it was a holiday in America. No one was going to come to work 25 Tuesday.
　　There was 26 for him to do. He had to wait. With nothing to eat 27 drink, Mr. Green slept for most of the time. Early Tuesday morning, his 28 came to work and found the elevator was not working. When the elevator was 29 , Mr. Green came out. He was cold, weak cold, weak, and tired. He had been in the elevator for about sixty-four 30 ! Now Mr. Green says, “I will only use elevators if they have a telephone in them.”

小题1: A．On B．One C．All D．None

小题2: A．buildings B．rooms C．steps D．floors

小题3: A．speak B．say C．shout D．laugh

小题4: A．saw B．heard C．came D．talked

小题5: A．until B．on C．by D．since

小题6: A．something B．nothing C．everything D．anything

小题7: A．and B．for C．or D．but

小题8: A．wife B．teachers C．parents D．workmates

小题9: A．closed B．opened C．clean D．empty

小题10: A．hours B．days C．minutes D．weeks