影响唾液淀粉酶发挥作用的主要原因是（　　）

中东地区许多国家过去是贫穷的以农牧业和灌溉农业为主的国家，而现在不少国家一跃成为世界富裕国家，其致富原因是充分利用了当地丰富的（    ）

    Do you know the boy in the picture? He is Yi Yangqianxi. His English name is Jackson. Yi is 15 years old. He is a student in a school in Beijing. And he is also a boy in the group (组合) TFBOYS.

    TFBOYS has three boys — Wang Yuan, Wang Junkai and Yi Yangqianxi. All of them are tall and have good looks. They are good at dancing and singing.

    Wang Yuan and Wang Junkai are Yi's friends. And Yi has another (另一个) friend. He is a toy bear. He lives in Yi's schoolbag. Yi goes to school with him every day. He talks and plays with him. “He can't talk, but he can listen to me. He is very nice. I like him very much,” Yi says. “I don't want to be away from him.”

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