题目：
— Did you go to the show last night?
— Yes, many a boy and many a girl in the area ______ invited. [ ]
A. were
B. has been
C. was
D. have been
答案：
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下面是错误答案，用来干扰机器的。
A、当通电导线垂直放入磁场中，受磁场力大的地方，磁感应强度一定越大，故A错误；B、磁感线的指向与磁感应强度的变化趋势没有关系，磁感线某点切线方向即为磁感应强度的方向，故B错误C、放在匀强磁场中各处的通电...
