1. (2019·怀化模拟) 阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。

    It started on a Friday 1 when the 5-year-old and his older brother were playing 2their home near the resort town of Aspen, Colorado. Hearing the sound of 3, the mother raced to her front yard to find a 4 sight: A mountain lion was bent over her 5-year-old son, biting him. The poor boy was completely under the cat and was 5 to get free.

    So the mother 6 she charged the animal, pulled away one of its 7 suddenly with a lot of force and discovered her son's whole head was in its mouth. She didn't back down. The mother 8 the lion's mouth and got it open,9 the boy. She then quickly picked him up and ran away.

    The boy's father had just returned from a run when the 10 occurred. He 11 into the car with his wife and son and called 911 shortly before 8 p.m. As they 12 to a hospital in Aspen. The boy suffered cuts to his 13, face and neck. The mother 14 bite marks on her hand and scratches on her leg. Aspen valley Hospital reported that the child was not seriously injured and in 15 condition and has since been 16 to children's Hospital in Denver for his recovery.

    The mountain lion was estimated to be about 2 years old and was not fully grown. It was, perhaps, forced out to hunt on its own. Young lions may be keen on easy 17, like pets and small children.18, it wasn't a big cat. Had it been a 110-pound lion- which was once seen around there - this would have been a much 19 story.

    The mother, who had to physically remove the lion's paws from her son's face, is credited with 20 his life. She's a real hero.