【完形填空题】完形填空题,请在题目前后使用一对“{{”、“}}”括起来;小题答案可跟在选项后,并用空格与选项内容隔开。如:Directions: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.Wolves belong to the animal family Canidae, which also includes such animals as the jackal, coyote, fox, and dog. Some of these canids, such as the fox, are solitary hunters and raise their young alone; wolves, 1 , are regarded as social animals, living in well-organized packs of 8 to 20 or more animals. A pack generally includes only one breeding pair and their offspring, but occasionally it may include one or two 2 wolves. Occasionally, different packs join together during difficult times, such as harsh winters, to find and bring down large game(猎物).The 3 nature of these packs is remarkable. Raising the pups, for instance, is a collective responsibility. Adult wolves in the pack may bring 4 to the mother while she is nursing; later they will feed the growing pups on partly 5 food they have regurgitated(反刍). Various adult wolves watch over the young ones, 6 them, playing with them, and teaching them to hunt.