问题
单项选择题
HLA-DNA定型试验PCR法的反应体系中，不需提供的的物质是()
A．引物
B．模板
C．DNA聚合酶
D．红细胞
E．核苷酸
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
HLA-DNA定型试验PCR法的反应体系中，不需提供的的物质是()
A．引物
B．模板
C．DNA聚合酶
D．红细胞
E．核苷酸
参考答案：D
| 完形填空。 | |||
| My dearest Aunt Mei lives in the __1__. She grows __2__ there and sells them in town. Sometimes she can't sell out all the vegetables, __3__ she brings (带来) some to us. Aunt Mei is old and short, but she's very __4__. She can walk __5__. Aunt Mei has no__6__ and she lives with her only white cat. Every summer, I go to stay with her for a week or two. She often __7__ me to a farm nearby (在附近). Life in the country is interesting. I can go fishing and I can __8__ birds singing. But Aunt Mei doesn't __9__ me swim. She says it's dangerous. Now the farmers (农民) don't do farm work __10__ animals. They use tractors. All of them look happy. | |||
| ( ) 1. A. farm ( ) 2. A. vegetables ( ) 3. A. but ( ) 4. A. fine ( ) 5. A. slowly ( ) 6. A. money ( ) 7. A. brings ( ) 8. A. look ( ) 9. A. agree ( ) 10.A. for | B. school B. rice B. so B. good B. fast B. food B. takes B. read B. like B. with | C. country C. wheat C. or C. happy C. near C. home C. lets C. listen C. let C. from | D. town D. animal D. and D. interesting D. far D. children D. wants D. hear D. ask D. between |