控制器与运算器合称______，是计算机的指挥中枢。
参考答案：中央处理器
After a serious illness, he finally _____ the importance of health. But it was too late. [ ]
A. regarded
B. mattered
C. realized
D. added
牛产和销售免征增值税货物或劳务的纳税人要求放弃免税权的，应当以书面形式提交放弃免税权声明，报主管税务机关批准。( )
