用分液漏斗不能分离的混合物是
A．醋酸和酒精
B．乙酸乙酯和碳酸钠溶液
C．溴苯和水
D．苯和水
答案：A
用分液漏斗能分离的是不互溶且可以分层混合物。
A．醋酸和酒精互溶没法分液；
B．乙酸乙酯和碳酸钠溶液分层，乙酸乙酯在上层，碳酸钠溶液在下层可以分离；
C．溴苯和水分层，水在上层，溴苯在下层可以分离；
D．苯和水分层，苯在上层，水在下层可以分离；
答案选A
I wandered in the park. The park bench was___21___ as I sat down to read beneath the long, straggly (蔓延的) branches of an old willow tree. I was disappointed by life with ___22___ reason to frown, for the world was intent on dragging me down. ___23___ that weren't enough to ruin my day, a young boy out of ___24___ approached me, all tired from play. He stood right before me and said with great excitement, "Look what I found!" In his hand was a flower, and what a ___25___ sight, with its petals(花瓣) all worn --- not enough rain, or too little light. I faked a small ___26___, wanting him to take his dead flower and leave, and then ___27___. But instead of leaving he sat next to my side and placed the flower to his nose and declared with surprise, "It surely smells pretty and it's beautiful, too. That's why I picked it; here, it's for you." The weed before me was dying or dead. Not brilliant colors, orange, yellow or red. But I knew I must ___28___ it, or he might never leave. So I reached for the flower, and replied, "Just what Ineed." But ___29___ him placing the flower in my hand, he held it mid-air without ___30___ or plan. It was then that I noticed for the very first time, that young boy could not see: he was blind. My ___31___ trembled, and tears shone like the sun as I ___32___ him for picking the very best one. "You're welcome," he smiled, and then ran off to play, not ___33___ of the impact he'd had on my day. I sat there and wondered how he ___34___ to see a self-pitying woman beneath an old willow tree. How did he ___35___ my difficult situation? ___36___ from his heart, he'd been blessed with true ___37___. At last I could see, ___38___ the eyes of a blind child, the problem was not with the ___39___; the problem was me. And for all of those times I myself had been ___40___, I vowed(发誓) to see beauty, and appreciate every second that's mine. I held that wilted(枯萎) flower up to my nose and breathed in the fragrance of a beautiful rose and smiled as that young boy.
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