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【判断题】
当边际效用为正时，总效用上升；边际效用为零时，总效用达到最大；当边际效用为负时，总效用下降。A.
正确
B.
错误
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举一反三
【单选题】Jack's speech was heard by a group of five judges,all of ____ agreed that it was the best one thisyear. [ ]
A.
who
B.
which
C.
that
D.
whom
【简答题】match and fill in the blanks
【简答题】A. Watching a basketball match. B. Cleaning up the new apartment. C. Going to the cinema with Margaret. D. Going shopping with her friends.
【单选题】His speech was heard by a group of five judges , all of_____agreed that it was the best.
A.
whom
B.
who
C.
them
D.
that
【单选题】Your speech was heard by a group of judges, all of _______ agreed that it was the best one this year..
A.
who
B.
whom
C.
which
D.
them
【简答题】A．Watching a basketball match. B．Cleaning up the new apartment. C．Going to the cinema with Margaret. D．Going shopping with her friends.
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