测定人体内体液的pH可以帮助我们了解身体状况．如图是明明同学体检报告单截图，看图后回答问题．

（1）该同学哪项指标出现异常____ ．

（2）医生让明明服用一种主要成分为氢氧化铝的药物，请写出该反应的化学方程式____ ．

（3）明明服用的药物，可用厨房中的一种物质代替，这种物质是____．

如图，已知线段AB，分别以点A，B为圆心，大于线段AB长度一半的长为半径画弧，相交于点C，D，连接AC，BC，BD，CD．其中AB=4，CD=5，则四边形ABCD的面积为____ 

阅读短文，完成下列问题

Dear Jenny,

   How are you? I am visiting my cousin Howard in Australia. It is hot in Hong Kong but it is cold in Australia in June. When it is summer in Hong Kong, it is winter in Australia. It is snowing heavily now. I like snow a lot and it is a white world outside. I will play with my cousin in the snow this afternoon. We want to make a snowman. I think it is very interesting!

   I like my cousin's house. It is big and there is a beautiful garden（花园）. We can play ball games. My cousin's neighbors are friendly but they cannot speak Chinese. I talk with them in English.

   See you next month.

 Tony

常温下，将NH₄NO₃溶于水得到无色溶液，为使溶液中的c（NH₄⁺）：c（NO₃^-）=1：1，可采取的下列措施是（      ）