April 13^th, 1539

    Outside Mexico City

Dear Mariana,

    Today we arrived safe. It was a long and dangerous trip over the ocean. The winter storms were strong. We were always a little sick from high waves.

    The journey from the shore to Mexico City is also long and dangerous. There are robbers in the countryside. We will travel together with the other ship passengers, thinking we will be safer as a group. Tomorrow we will travel into the city to find our uncle.

    Father says it will take a year for this letter to reach you. The trip from New Spain to Spain is very long.

Your loving brother,

Tomas

    April 20^th, 1539

    Mexico City

Dear Mariana,

    Father and I finally arrived at Mexico City. Here, old buildings are being pulled down; new ones are being built. Just around the corner from Uncle's city house, Aztec workers are pulling down a small, beautiful pyramid. Father says it is one of the last Aztec temples.

    In the center of the city, I met an Aztec boy named Carlos. He speaks a little Spanish. Carlos learns Spanish at his new school. He told me that the Spanish set up new schools for the Aztecs. There he got his new name, Carlos. He says he likes his new school but misses his old city. I wonder what this city used to be like before Cortes came.

    Tomorrow we will go to Uncle's farmland. He and father are talking about the Aztec workers that father will oversee.

Your brother,

Tomas

found v. 建立        battle n. 战役        conquer v. 征服

“我们新疆好地方啊,天山南北好牧场,戈壁沙滩变良田,积雪融化灌农庄,麦穗金黄稻花香啊,风吹草低见牛羊,葡萄瓜果甜又甜,煤铁金银遍地藏……”这是新疆人民赞美自己家乡的歌曲。新疆的“葡萄瓜果甜又甜”的原因是(    )

下列选项中属于脊椎动物的是（    ）

①鱼类

②节肢动物

③软体动物

④爬行动物

⑤鸟类

⑥环节动物

老师为同学们提供了如图所示的实验装置：

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