根据国务院发布的《关于蓄滞洪区安全与建设指导纲要》，对蓄滞洪区的土地利用和生产活动应进行（）。
A、鼓励
B、限制
C、任其自然
参考答案：B
One of the most beautiful natural wonders in the United States must certainly be the Grand Canyon, ______ in Arizona.
A．and located
B．whose location
C．is located
D．which is located
断耳疮的辨证治疗原则是：
A．清热解毒，消肿止痛B．清热解毒，活血止痛C．清热解毒，通利耳窍D．清热解毒，排脓止痛E．清热解毒，去腐消肿
