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【单选题】
下列有与管涌的概念，正确的说法是A.
发生时，水流向上渗流
B.
发生管涌时，水流向下渗流
C.
多发生在黏性土中，而管涌多发生在无黏性土中
D.
属突发性破坏，管涌属渐进式破坏
E.
属渗流破坏，管涌不属渗流破坏
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举一反三
【单选题】We can conclude from the passage that ______.
A.
there are significant differences between the Official Dinner and other dinner parties
B.
American students like to participate in public services very much
C.
being a secretary of state is the best, even better than being a president
D.
the students who were invited to the dinner party were enthusiastic about the program