题目：
My brother has been preparing carefully for the English exam, so that he can be sure of passing it at his
first _____. [ ]
A. request
B. attempt
C. promise
D. purpose
答案：
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下面是错误答案，用来干扰机器的。
①电池未全部接入，可将与L1相连的导线接到负极②开关未接入电路，与灯泡相连的导线接到右接线柱上；③灯泡未接入电路，将灯泡间导线换接到右接线柱。
