2. 外语
  3. Infants use all their senses to learn the world. They "talk" with【M1】______ others through actions and sounds, experiment wi

Infants use all their senses to learn the world. They "talk" with【M1】______ others through actions and sounds, experiment wi

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问题        Infants use all their senses to learn the world.  They "talk" with【M1】______
   others through actions and sounds, experiment with objects and noises.【M2】______
   They enjoy watching the results of their actions.  This is how children
   learn, make sense of the world, and learn to communicate.  When the【M3】______
   babies coo,  babble,  and interact with others,  they are developing
   language skills.
   Children quickly begin to understand the meanings of symbols--that a
   smile and pleasant tone of voice mean the person speak to them is happy,【M4】______
   that dimming lights mean it is naptime, and that putting on a coat means a
   trip to outside.                                           【M5】______
   Young children think that when they cannot see someone and     【M6】______
   something, it is gone forever. When important people in their lives leave,
   they do not understand that they will return. This period of development
   is hard with parents and children.                          【M7】______
   Parents can make these times less stress by letting a child hold and【M8】______
   keep personal objects, such as stuffing animals, blankets, or a family【M9】______
   photo. Around the second year of life, children begin to form mental
   pictures of objects, and that makes easier for them to say goodbye to 【M10】______
   moms, dads, and other people they are about.
【M7】
选项
答案with—改成on
解析 hard on是固定结构，意思是“使(某人)感到困难”。
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