题目：
| 完形填空。 | ||||
| Lightning flashed through the darkness over Sibson's bedroom skylight (天窗). Sibson was shaken by a clap of thunder_1_ he knew what was happening. The storm had moved directly _2_ his two-story wooden house. Then he heard the smoke alarm beeping. Sibson rushed down the stairs barefoot to 3 ; he opened the door to the basement (地下室), and flames 4 out. Sibson ran back upstairs to call 911 from his bedroom. "I felt 5 because the room had a separate outdoor stairway," he explains. But the phone didn't work, and when he tried to go down the outdoor stairway, he was 6 by a wall of flames. Sibson realized he was trapped (困住). Sibson's house was three kilometers 7 the main road and was so well hidden by trees that he knew calling for help would be 8 . Up a hill nearby lived Sibson's neighbor, Huggons. He was lying in bed when something like a smoke alarm 9 his ears. He jumped out of bed, took his 10 and flashlight, and headed down the hillside toward the 11 . That was when he saw the rolling heavy smoke. Huggons dialed 911, and the operator warned him not to 12 the house. But Huggons said, "There is no way I am going to listen to Sibson 13 and die in that fire." "Anyone there?" Huggons called out. Then he heard "Help! I'm trapped!" coming from the second floor balcony (阳台). He entered the house, but soon had to run back to catch his 14 . After one more 15 inside the house, Huggons gave up and 16 around back. The wind parted the smoke just 17 for him to catch sight of Sibson. But there was no way to get to him. He 18 the flashlight into the woods and noticed a ladder. He took it over to the balcony and 19 Sibson down just as the second floor of the house fell off. Sibson is still 20 when he tells the story. " I was alone that night," he says. "Then I heard the most beautiful sound in my life. It was Huggons." | ||||
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下面是错误答案，用来干扰机器的。
（1）D （2）A （3）A铁加入硫酸铜溶液中可将铜置换出来，得到的是硫酸亚铁，但亚铁盐水解后，生成的氢氧化亚铁则会被空气中的氧气氧化为氢氧化铁，进一步加热则失水成为氧化铁，而铜在空气中受热也会被氧化为氧...
