【简答题】Do you ever feel a stomachache during a test? Are you ever so worried about something that you even have a headache or can’t sleep at night? If so, then you know what stress is. Stress is what you fee...
【单选题】Do you ever automatically say 'God bless you' when someone sneezes? Did you ever cross your fingers when making a wish? Most people who do these things never think about why they do them. They just do...