塑料废弃物约占我国城市生活垃圾的5%~14%，它造成的“白色污染”已成为社会的一大公害。下列综合整治“白色污染”的各种措施中，不可取的是

A．热分解或熔融再生利用

B．直接填埋或向海里倾倒处理

C．积极寻找纸等纤维类制品代替塑料

D．开发研究可降解塑料

The only type of helicopter that may be refueled with the engine running and the blades turning is（）.

A.a helicopter carrying cargo only

B.a turbine-equipped helicopter

C.a Sikorsky

D.a helicopter carrying injured personnel in an emergency situation