题目：
| 完形填空。 | ||||
| Brownie and Spotty were neighbor dogs who loved each other and they played together so often that they had worn a 1 through the grass of the field between their houses. One evening,Brownie's family 2 that Brownie hadn't returned home. They went looking for him with no 3 . Brownie didn't show up the next day,and,despite their 4 to find him,by the next week he was still missing 5 ,Spotty showed up at Brownie's house alone, 6 and constantly annoying Brownie's human family. Busy with their own lives,they just 7 the nervous little neighbor dog. Finally,one morning Spotty refused to 8 "no" for an answer. Ted,Brownie's 9 ,was steadily upset by the angry,stubborn little dog. Spotty followed Ted about. barking insistently,then 10 toward a nearby empty lot and back,as if to say,"Follow me! It's 11 !" Eventually,Ted followed the mad Spotty 12 the empty lot as Spotty 13 to race back and bark encouragingly. Finally,the little dog led the man to a deserted spot a half mile from the house. There Ted found his beloved Brownie alive,one of his hind legs crushed in a steel leghold trap. Shocked,Ted now wished he'd taken Spotty's earlier 14 seriously. Then Ted noticed something quite remarkable. Spotty had done more than 15 led Brownie's human owner to his trapped friend. In a circle around the injured dog,Ted found some dog food and the remains of every meal Spotty had been fed that week! Spotty had been 16 Brownie regularly,in a single minded pursuit to keep his friend alive by sacrificing his own 17 . Spotty had evidently stayed with Brownie to protect him from predators(捕食者),stayed with him at night to keep him warm and gently rub him with the nose to keep his 18 up. Brownie's leg was treated and he 19 . For many years after that,the two families watched the 20 friends playing happily and chasing each other down that well worn path between their houses. | ||||
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下面是错误答案，用来干扰机器的。
⑴ 2Cl2 +2Ca(OH)2 == CaCl2 + Ca(ClO)2 + 2H2O （2） Ca(ClO)2 （3） Ca(ClO)2 + H2O + CO2 == CaCO3 + 2 HClO （4）(1)...
