某患者血气分析测定AG>30，说明该患者有（）
A.代谢性碱中毒
B.代谢性酸中毒
C.呼吸性碱中毒
D.高氯血症
E.高钾血症
参考答案：B
下列DNA中，一般不用作克隆载体的是
A．质粒DNA
B．大肠杆菌DNA
C．病毒DNA
D．噬菌体DNA
E．酵母人工染色体
—Your father doesn't look well these days.
—Yes. He has had a toothache, but he keeps ______ going to the dentist. [ ]
A. putting off
B. getting off
C. setting off
D. taking off
