中央处理器功能主要是解释计算机指令以及处理计算机软件中的数据。
参考答案：对
重症哮喘出现下列哪些情况为病危（）
A.意识障碍和血压下降
B.明显脱水和发绀
C.严重吸气凹陷
D.呼吸音明显减弱
E.PaO2<50mmHg，PaCO2>45mmHg，pH<7.30
John promised his doctor he________not smoke, and he has never smoked ever since. [ ]
A. might
B. should
C. could
D. would
