问题
单项选择题
储留氮是指（）
A.储留氮=食物氮-粪氮
B.储留氮=食物氮-尿氮
C.储留氮=食物氮-（尿氮-粪氮）
D.储留氮=消化率×生物价
E.储留氮=吸收氮-（尿氮-尿内源性氮）
答案
参考答案：E
解析：考查储留氮的含义。
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储留氮是指（）
A.储留氮=食物氮-粪氮
B.储留氮=食物氮-尿氮
C.储留氮=食物氮-（尿氮-粪氮）
D.储留氮=消化率×生物价
E.储留氮=吸收氮-（尿氮-尿内源性氮）
参考答案：E
解析：考查储留氮的含义。
Now that I am no longer young, I have friends whose mothers have passed away. I have heard these sons and daughters say they never fully appreciated their mothers ___36___ it was too late to tell them. I am blessed with the dear mother who is still alive. I ___37___ her more each day. My mother does not change, but I ___38___. As I grow older and wiser, I realize ___39___ an exceptional person she is. How ___40___ that I am unable to speak these words in her ___41___, but they flow easily from my pen. How does a daughter begin to thank her mother for life itself? For the love, patience and just ___42___ hard work that go into ___43___ a child? For running after a toddler (学走步的小孩), for understanding a ___44___ teenager, for tolerating (忍受;容忍) a college student who knows ___45___ ? For waiting for the day when a daughter ___46___ how wise her mother really is? How does a ___47___ woman thank a mother for ___48___ to be a mother? For being ready ___49___ advice (when asked) or remaining ___50____ when it is most appreciated? For not saying, “I told you so,” when she could have uttered these words ___51___? For being ___52___ herself-loving, thoughtful, patient, and forgiving? I don’t know how, dear God, except to ask you to bless her as richly as she ___53___ and to help me live up to the example she has ___54___. I pray that I will look as good in the eyes of my children as my mother ___55___ in mine.
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