下列数据分别表示出生率和死亡率,其中自然增长率最高的一组是[ ]
A.2%,1.7%
B.5%,1.5%
C.5%,1.7%
D.0%,0.8%
答案:B
Danny is playing _____ and Tom is playing _____ .[ ]
A. piano, football
B. a piano, a football
C. piano, the football
D. the piano, football
全脊麻演变过程中哪一致命并发症最先发生()
A.脉搏细弱
B.心跳骤停
C.意识消失
D.呼吸停止
E.血压下降