体内红细胞绝对数增多见于（）
A.糖尿病酮症酸中毒
B.腹泻
C.慢性肾上腺皮质功能减退
D.严重慢性心肺疾病
E.大面积烧伤
参考答案：D
解析：红细胞相对性增多主要是由于血液浓缩，如呕吐、腹泻、大量出汗、大面积烧伤、尿崩症、肾上腺皮质功能减退、甲状腺危象、糖尿病酮症酸中毒等，使血浆容量减少，而表现为红细胞容量相对增加。绝对性增多是由于外界缺氧（如高原居民）或体内缺氧（如严重的心肺疾患），由于血氧饱和度低，使红细胞代偿性增多，真性红细胞增多症也是红细胞数绝对增多，但一般不考查。
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| Early one morning, an old woman was carrying a big basket of cabbages on her hand to the market. She hoped to 1 them to the people from the town. The mountain road was narrow(窄的) and the old woman was walking 2 , because she did not want to have 3 and lose her cabbages. Suddenly she 4 a loud noise, and a bicycle came round the comer. It passed her and went very fast 5 the hill. The old woman had to jump to one side of the 6 so quickly that the basket of cabbages nearly fell into the valley( 山谷). She looked up and saw that a young boy was on the bicycle. He was 7 on without even looking round to see 8 the old woman was all right. The old woman began to shout, "Come back, young man! You dropped something!" When he heard this, the boy stopped the bicycle so suddenly that he 9 fell off his bicycle.Then he turned and began to 10 the bicycle back up to the hill. "What is it!" he asked. "What did I drop?" " Young boy, " the old woman answered, "you dropped your manners(礼貌) . " | ||||
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