Semantics is the study of word meaning.
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If there is a stigma attached to something, people feel uncomfortable about it.
A. 对
B. 错
If you bemoansomething, you are satisfied with it.
A. 对
B. 错
If you rake over something, you want to keep talking about it.
A. 对
B. 错
If you reciprocate, you respond to someone by doing the same thing.
A. 对
B. 错