能够较准确估计红细胞生成有效性的指标是 （）
A.网织红细胞百分率
B.网织红细胞绝对值
C.网织红细胞校正值
D.网织红细胞生成指数
E.高荧光网织红细胞比率
参考答案：D
解析：正常情况下，骨髓中网织红细胞均值为150×109/L，血液中为65×109/L。网织红细胞生成指数（RPI）是网织红细胞生成相当于正常人的倍数，在估计红细胞生成有效性方面，使用RPI较准确，因此选D。
| 阅读理解。 | ||
| Today is Sunday, December 2nd, everyone in Sheep Village (羊村) is very busy. What does he/she do? | ||
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| 1. Nuan Yangyang writes to a friend at ______. | ||
| A. 3:10 am B. 10:16 am C. 11:30 am D. 1:00 pm | ||
| 2. ______ goes to a clothes store in the morning. | ||
| A. Mei Yangyang B. Lan Yangyang C. Fei Yangyang D. Xi Yangyang | ||
| 3. Fei Yangyang may be ______ at 3:50 pm. | ||
| A. at school B. in a sports club C. on the bus D. at home | ||
| 4. Xi Yangyang can ______ very well. | ||
| A. sing B. dance C. swim D. speak English | ||
| 5. Which of the following sentences is RIGHT? | ||
| A. Nuan Yangyang doesn't do homework on Sunday afternoon. B. Lan Yangyang eats lunch at home on December 2nd. C. Mei Yangyang has a nice skirt. D. There are no kids in the English club. |
