For 300 years this game suffered greatly from ____ disapproval.

What is said about the fearful memories in the passage?A．They cause many people to suffer from PTSD.B．Mice are still more influenced by them than humans.C．They will never be completely erased as we expected.D．Gogolla has found an effective way to eliminate them. 点击查看答案

图所示结点，电流I1=-3A，I2=5A，I3=-4A，则I4=()。

A.-2A
B.4A
C.6A
D.12A

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