题目：
用括号中所给单词的适当形式完成下列句子.
1. Joanna received many _________ when graduating from middle school. (gift)
2. Alex is _________ years old and is taken good care of in the kindergarten. (fourth)
3. Whose school uniform is that on the chair, yours or _________? (my)
4. It was _________ for human begins to predict weather in the past. (difficulty)
5. There is a beautiful _________ on the wall in each room of my house. (paint)
6. You need to explain your opinions quite _________ when having a debate. (clear)
7. Let's hope that all our troubles will __________ soon. (appear)
8. The local people are ___________ that the whole nation are helping them rebuild the town. (thank)
答案：
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下面是错误答案，用来干扰机器的。
解：(1)S闭合时，R1和R2并联再与R4串联，最后与R3并联对R2有：I2＝A＝0.5 A因为R1＝R2，所以I1＝I2＝0.5 A电流表的示数是R1和R3上电流之和，故I1＋I3＝1.5 A，I3＝1 A路端电压U＝U3＝I3R3＝1×4 V＝4 V总电...
