73

　　No matter where you are on the risk-seeking range, scientists say that your willingness to take risks increases during your teenage years.

　　74

　　To help you do that, your brain increases your hunger for new experiences. New experiences often mean taking some risks, so your brain raises your tolerance for risk as well.

　　75

　　For the risk-seekers, a part of the brain related to pleasure becomes active, while for the rest of us, a part of the brain related to fear becomes active.

　　As experts continue to study the science of risk-seeking, we’ll continue to hit the mountains, the waves or the shallow end of the pool.

　　A. It all depends on your character.

　　B. Those are the risks you should jump to take.

　　C. Being better at those things meant a greater chance of survival.

　　D. Thus, these well-equipped people survived because they were the fittest.

　　E. This is when you start to move away from your family and into the bigger world.

　　F. However, we are not all using the same reference standard to weigh risks and rewards.

　　G. New brain research suggests our brains work differently when we face a nervous situation.

　　【解析】

　　2015年全国2卷，

　　Training for a marathon requires careful preparation and steady, gradual increases in the length of the runs.

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