如图所示电路中，已知I1＝1A，I2＝5A，I5＝4A，则I4应为（）A。
A.－10
B.－2
C.2
D.10
参考答案：B
已知（x-2）2+|y+1|=0，则x+y的值是（ ）
A．1
B．-1
C．-3
D．3
— I don't know where to go for vacation?
— Why visiting Paris? [ ]
A. don't consider
B. not consider
C. don't think
D. not think
