种群繁衍是动物行为的目的之一，所以动物往往具抚育行为，下列符合抚育行为的是（）

A、哺乳动物的胚胎在子宫内发育

B、母兽遇敌口叼幼仔行走

C、亲鸟以鸣叫声给雏鸟以学音示范

D、长臂猿之间常呼号以示位置

　　Questions 11 to 15 are based on the following passage

　　Among all the animals, the ape is most like human beings. Both people and apes have the similar brain structure, the similar nerve system, and the similar kind of blood.

　　There are four kinds of apes: the chimpanzee（黑猩猩), the orangutan（猩猩), the gorilla（大猩猩), and the gibbon（长臂猿). They live in the deep forests and warm tropical regions of Africa and of Southeast Asia, including Indonesia.

　　All apes are covered with brown, reddish-brown, or black hair everywhere on their bodies except their faces, feet, and hands. Their hands each have four fingers and a thumb that helps them grip things the way our thumbs help us. But they also have a thumb on each foot instead of a big toe. Thus they can hold things with their feet also. Having short, weak legs, apes do not walk on the ground very much. However, their arms are very strong. This enables them to swing from branches and travel very quickly from tree to tree.

　　These animals live in small family groups that move from place to place in search of vegetables and fruits. They also eat eggs, small animals, nuts, and insects. When they are tired, they build nests in the trees. But they rarely sleep there for more than a night or two. Then they move on to look for more food.

　　There are some differences among the following three kids of apes. The gibbon is never more than three feet high and weight only about fourteen pounds. The gorilla grows to be six feet tall and weight up to 600 pounds. The orangutan is smaller than the gorilla. It stands three to five feet tall and weight up to 200 pounds.

　　Chimpanzees are the smartest of all apes. They can be taught to sit at a table and eat, to dress themselves, and to do things that human children can do.

　　11. What does the first paragraph tell us？

　　[A] The ape looks like human beings most.

　　[B] People and the ape think alike.

　　[C] People and the ape behave alike.

　　[D] The ape is the most intellectual animal in the world.

　　12. Which of the following sentences is TRUE？

　　[A] All apes are brown or black.

　　[B] All parts of apes' bodies are covered with hair.

　　[C] Apes have weak legs but very strong arms.

　　[D] Apes' arms are strong enough to swim.

　　13. Apes build nests in the trees but seldom sleep there for more than a night or two because ________.

　　[A] They like to live in small family groups

　　[B] They like to move from place to place in search of more food

　　[C] They like to eat eggs, small animals, nuts and insects

　　[D] it rains too often in the deep forests

　　14. Among the three kinds of apes, ________.

　　[A] the gorilla is the biggest

　　[B] the gibbon is only three feet high but it is heavier than the orangutan

　　[C] the orangutan is smaller than the gorilla and cleverer than the gibbon

　　[D] the orangutan can stand up to a great height, but others cannot

　　15. The last paragraph tells us that ________.

　　[A] chimpanzees can do better than human children

　　[B] chimpanzees can do many things that human children cannot do

　　[C] human children can do many things that chimpanzees cannot do

　　[D] the intelligence of chimpanzees is similar to that of human children