问题
单项选择题
One of the most （） challenges that the United States-and indeed, the world-will face in the next few decades is how to alleviate the growing stress that human activities are placing on the environment.
A．consequential
B．subsequent
C．emergent
D．pressing
答案
参考答案：D
解析：
pressing迫切的。consequential结果的。subsequent后来的。emergent突然出现的。