语法填空

   There are two sets of Games-the Winter and the Summer Olympics, and 1__________ are held every

four years on a regular basis. The Winter Olympics are usually held two year 2________ the Summer

Games. Only athletes 3______________ have reached the agreed standard for their event

4(admit)________________ as competitors. They may come from 5___________ in the world.

     There are no running races 6___________ horse riding events. 7______________ there are

competitions like skiing and ice skating 8______________ need snow and ice. That's 9_________

they're called the Winter Olympics. It's in the Summer Olympics 10____________you have the running

races, together with swimming, sailing and all the team sports.

艾里康宁和达维多夫划分儿童年龄阶段的标准是( )。

A．生理发育

B．智力发展

C．个性特征

D．活动特点