When Jack eventually overtook the last track he pulled over to the inside lane.
A. skipped
B. passed
C. reached
D. led
半抗原的基本特点是
A. 分子量小 B.无免疫原性,无抗原性
B. 有免疫原性,无免疫反应性 D.无免疫原性,有抗原性 E.以上都不是
通过电子俘获发射俄歇电子的放射性核素是
A. 131I
B. 125I
C. 212Bi
D. 32P
E. 188Rb
Peter is experiencing a difficult time in his life.
A. going into
B. going out of
C. going over
D. going through