阅读下列短文，从每题所给的四个选项A、B、C和D中，选出最佳选项。In the United States elementary education begins at the age of six.At this stage nearly all the teachers are women，mostly married.The atmosphere is usually very friendly，and the teachers have now accepted the idea that the important thing is to make the children happy and interested.The old authoritarian(要绝对服从的)methods of education were discredited(不被认可)rather a long time ago—so much that many people now think that they have gone too far in the direction of trying to make children happy and interested rather than giving them actual instruction. The social education of young children tries to make them accept the idea that human beings in a society need to work together for their common good.So the emphasis is on co­operation rather than competition throughout most of this process.This may seem curious，in view of the fact that American society is highly competitive；however，the need for making people sociable in this sense has come to be regarded as one of the functions of education.Most Americans do grow up with competitive ideas，and obviously quite a few as criminals，but it is not fair to say that the educational system fails.It probably does succeed in making most people sociable and ready to help one another both in material ways and through kindness and friendliness.1.According to the passage，the US elementary education is supposed to make children ______.A.happy and interestedB.competitive and interestedC.curious and friendlyD.happy and co­operative2.Some Americans complain about elementary schools because they think______.A.children are reluctant to help each otherB.schools lay too much emphasis on co­operationC.children should grow up with competitive ideasD.schools give little actual instruction to children3.The American educational system emphasizes______.A.material wealthB.competitionC.cooperationD.personal benefit4.The word “sociable” most probably means______.A.fond of talking freelyB.friendly with other peopleC.concerned about social welfare(福利)D.happy at school