Today is Sunday. It's a sunny day. I'm in the park with my best friends Mary and Carol. There are many people in the park. They're doing different kinds of things. Some are walking by the lake. Some are talking under a big tree. Some are singing. Some are dancing on the playground. There are some kids playing tennis. Mary, Carol and I are sitting by the pool. It's really a fun day. The people here are all very happy. They're having a good time.

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2015•武汉）如图，已知点A（﹣4，2），B（﹣1，﹣2），平行四边形ABCD的对角线交于坐标原点O．

植物和动物体内都具有的糖是(    )          

印第安人和因纽特人在人种上属于（　　）

【数据分析】若撤去图乙中的C装置，则测得工业烧碱的纯度将____（填“偏高”、“偏低”或“无影响”）。