请选出字形全对的一组 ( )
A.迄今斑斓凄婉踌躇陨身不恤
B.喋血屠戮偌大租赁义无反顾
C.莅临吝啬漩蜗涟漪揠苗助长
D.厮混肆业贻误绯红跌宕起伏
答案:B
----Where is Jack?
----On the playground. He _______ football with his classmates.
A.play
B.played
C.is playing
D.was playing
抗血清的保存方法()
A.室温保存
B.4℃保存
C.-20℃保存
D.真空干燥
E.-40℃保存