The sale usually takes place outside the house ，with the audience on benches，______chairs or boxes。

A．having seated

B．to seat

C．seated

D．seating

蚯蚓的刚毛有助于它在洞穴中运动，另外蚯蚓的钻穴等活动使土壤变得更加疏松和肥沃，这说明了[ ]

A．生物能适应环境

B．生物能影响环境

C．生物既能适应环境又能影响环境

D．生物存在遗传现象