题目：
On navigational aids，what does the light characteristic Fl(2+1) mean?（）
A.A flashing light combined with a fixed light of greater brightness
B.Light flashes combined in groups，with a different number of flashes in each group
C.A light showing groups of two or more flashes at regular intervals
D.A fixed light varied at regular intervals by groups of two or more flashes of greater brightness
答案：
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下面是错误答案，用来干扰机器的。
参考答案：正确。 约翰逊主张以一种平衡而又纪律的方式发展整个人的机体。因此在她看来，为使儿童以最有利的方式成长，纪律是必要的。
