We can no longer ________ to consider water an almost free resource that we can use as much as we like.

A．permit

B．afford

C．expect

D．offer

进入封闭舱室不应（）.

A、进入前进行自然或人工通风

B、仪器测试，确认无有害气体，不缺氧

C、进入者系上安全绳

D、进入者须佩戴过滤式呼吸器