Smith was overweight, so the doctor urged that not only ________ have less fat and meat, but also he ________.

A．should he; take exercise

B．ought he; take exercise

C．he should; takes exercise

D．he ought; takes exercise

计算机病毒除通过读写或复制移动存储器L带病毒的文件传染外，另一条主要的传染途径是

A．网络

B．电源电缆

C．键盘

D．输入有逻辑错误的程序