1 . 请选出单词过去式全对的一组。

A．became     prefered       chose       drove

B．kept       built        layed       stood

C．spread       beat        read        cost

D．sold       hold        told        stole

3 . This medicine called artemisinin soon became a standard treatment for malaria to save people’s life. 此句中谓语动词为_______.

A．called

B．became

C．treatment

D．save