临床上引起最危险的输血反应的抗体是（）
A.抗A和抗B
B.抗D
C.抗K
D.抗E
E.抗C
参考答案：A
Though in his seventies,the old man is still as ________ as a young man and hates sitting around doing
nothing all day.[ ]
A. enthusiastic
B. energetic
C. talkative
D. sensitive
“月球制氧机”可利用聚焦太阳能产生的高温加热月球土壤，制得氧气，说明月球土壤中一定含有
A．氧化物
B．氧气
C．水
D．氧元素
