长期用激动药,可使相应受体数目减少,这种现象称为(),是机体对药物产生()的原因之一。
参考答案:向下调节;耐受性
When I wanted to buy a computer, I saved as much as I could, and my mother the rest of the money.
A.kept up
B.held up
C.tool up
D.made up
我是歌手第三季的歌王是?