Listen! Class Two _______ an English song in the next room. [ ]

A. are singing

B. were singing

C. was singing

D. is singing

临床常见用药指征不严，多用、乱用的药物包括( )。

A．肾上腺皮质激素类药物

B．解热镇痛药

C．抗生素

D．维生素类

E．降压药