问题
单项选择题
血浆中起关键作用的缓冲对是（）
A.KHCO3／H2CO3
B.NaHCO3／H2CO3
C.K2HPO4／KH2PO4
D.Na2HPO4／NaH2PO4
E.蛋白质钠盐／蛋白质
答案
参考答案：B
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血浆中起关键作用的缓冲对是（）
A.KHCO3／H2CO3
B.NaHCO3／H2CO3
C.K2HPO4／KH2PO4
D.Na2HPO4／NaH2PO4
E.蛋白质钠盐／蛋白质
参考答案：B
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| "I love you, Bob." "I love you, too, Nancy." My parents' loving reassurances were sweet, touching and surprising. They married on September 14th, 1940, after several __1__ she was __2__ 30 and knew it was time to start a(n) __3__. The handsome, welleducated man who came by her office was __4__ by her figure, her blue eyes. The __5__ didn't last long. Seeds of __6__ started to grow almost immediately. She liked to travel; he __7__ the thought. He loved golf; she did not. He was a Republican; she was a Democrat. They __8__ at the bridge table, at the dinner table, over money, and so on. __9__, they owned a business together and the __10__ frustrations (挫折) of life at the office came to cause trouble at home. There was a hope that they would __11__ once they retired, and the angry winds did calm somewhat, __12__ what remained made itself bright, hard bitterness. "I always thought we'd… " my mother __13__ begin, before launching __14__ a long list of my father's faults, which I can still recite today. __15__ he listened, my father would murmur angry threats and curses(辱骂). It wasn't the happiest marriage, but as their 60th anniversary __16__, my sister and I decided to throw a party. Sixty years was a long time, __17__; why not try to make the best of things? We'd provide the cake, the balloons, the toasts, and they'd abide by one rule: no __18__. The agreement was honored. We had a wonderful__19__. It was an important celebration, because __20__, things began to change for my parents. As debilitating dementia (老年痴呆症) settled in, their marriage was about the only thing they wouldn't lose. | ||||
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