第二部分：英语知识运用（共85分）
第一节：单项选择（共15小题，每题1分，共15分）
21．It is likely that water is not ____ endless resource, nor ____ that can be made once more．
A．the; / B．an; one C．an; that D．/; one
22．According to a UN report, one third of the world population have no ____ to clean drinking water and health care．
A．means B．approach C．channel D．access
