流行过程的基本条件是_____，_____，_____，
参考答案：传染源；传播途径；人群易患性
In the following sentences, which recipient in English becomes modifier in Chinese（）
A. It is raining.
B. We all joined in the battle.
C. He bought tea, coffee, eggs, milk, etc.
D. John hit the pickpocket on the head.
SQL是一种______程序设计语言。
A．过程式 B．非过程式 C．面向对象 D．逻辑程序设计
