完型填空2 （共8小题；满分12分）
Directions: Complete the following passage by filling in each blank with one word that best fits the context.
The gorilla (猩猩) is ______ rare animal that lives in Africa. Gorillas are very big animals. Male gorillas are usually taller and bigger ______ female gorillas. Male gorillas can reach a height of 1.8 m and can weigh 140-180 kg. Female gorillas can reach a height of 1.5 m and, on average, weigh 90 kg. Gorillas are usually black ______ color. Their bodies are covered with black or brown fur. Some gorillas have red hair on their heads. Male gorillas over ten years of age have silver hair on ______ backs.
Gorillas are social animals and live in family groups. A typical family includes one adult gorilla, ______ is the leader of the family. Some families can have as many as 50 members_____ others include only a few members. Gorillas sleep about 13 hours a night ______ rest for several hours during the day. Gorillas are quiet and shy animals and their only natural enemy is human beings. ______ the growth of the human population and the development of farming, there is a question as to whether gorillas can survive. Thankfully, most countries have passed laws to protect them.