A、They appear restless. B、They become upset. C、They lose consciousness. D、They die almost instantly. D短文中提到，当把从极度愤怒或恐惧的人身上提取的血液样

Scientific experiments have demonstrated incredible ways to kill a guinea pig, a small furry animal. Emotional upsets generate powerful and deadly toxic substances. Blood samples taken from persons experiencing intense fear or anger when injected into guinea pigs have killed them in less than two minutes. Imagine what these poisonous substances can do to your own body. Every thought that you have affects your body chemistry within a split second. Remember how you feel when you’re speeding down the highway and a big truck suddenly brakes twenty meters in front of you. A shock wave shoots through your whole system. Your mind produces instant reactions in your body. The toxic substances that fear, anger, frustration and stress produce not only kill guinea pigs but kill us off in a similar manner. It is impossible to be fearful, anxious, irritated and healthy at the same time. It is not just difficult; it is impossible. Simply put, your body’s health is a reflection of your mental health. Sickness will often then be a result of unresolved inner conflicts which in time show up in the body. It is also fascinating how our subconscious mind shapes our health. Do you recall falling sick on a day when you didn’t want to go to school? Headaches brought on by fear? The mind-body connection is such that if, for example, we want to avoid something, very often our subconscious mind will arrange it. Once we recognize that these things happen to us, we are halfway to doing something about them.
Questions 12 to 15 are based on the passage you have just heard.
12. What happens to guinea pigs when blood samples of angry people are injected into them?
13. What does the speaker say about every thought you have?
14. What does the speaker say is impossible?
15. What does the passage say about our mind and body?