受交感神经支配，导致心率加快的肾上腺素能受体是
A．肾上腺素B．去甲肾上腺素C．乙酰胆碱D．多巴胺E．5-羟色胺
参考答案：B
Tom says he can be equal to this task.That's ________ I disagree. [ ]
A. where
B. what
C. when
D. why
下列程序执行后的输出结果是______。main() int m[][3]=1,4,7,2,5,8,3,6,9 int i,k=2 for(i=0;i＜3;i++) print("%d",m[k][i]);
A．456
B．258
C．369
D．789
