七选五: 根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两多余选项。 Being scared is not always a treat. When a balloon pops, we may jump. 36 . How does the body triggered ( 激发 ) these reactions? When we encounter something we’re not familiar with, our brain and body start making changes to help prepare us for the unknown. These changes are part of the body’s “threat, ” “stress, ” or “fight-or-flight” response. This response is triggered by the five senses, which are always sending information to the brain. 37 , the brain sounds a danger alarm. It releases chemicals into the bloodstream, and those chemicals act on different parts of the body. Once the body is alert ( 警觉的 ), the brain decides whether or not the danger is real. 38 . It urges a person to hide, run away, or defend oneself. Faster heartbeat and breathing send more blood and oxygen to the muscles so they’re ready when they’re needed. Stress chemicals can make a person more alert. Our memories also help protect us. We keep a close eye on babies because they don’t understand what might hurt them. As babies grow, they learn what’s unsafe, and their brains store those memories. 39 . Experiences can lead to long-lasting fears that may stop a person from trying new things. We’re born with the ability to feel fear, but a lot of what we’re afraid of is learned. A long-lasting fear can mean you’ve had a bad experience, and your brain doesn’t want you to have it again. Many people have beaten their own fears. Here’s one method. 40 , they learn the facts about anything that seems scary. Knowledge can help a person feel less afraid. A. Instead of listening to their imagination B. When they signal something unexpected C. Our heart beats harder, and we breathe faster D. Then their brains use fear to warn them of dangers E. It’s good to have a healthy sense of what’s dangerous F. Fear is a tool that the brain uses to keep the body safe G. Memories are an important factor in fear-lasting experiences