选词填空（15选10） Teenagers are different from people of otherage groups. The differences can be ___21___ from how they behave. In fact, thebrains of teenagers are very different from those of children or adults. Once people believed it was ___22___ that the human brain was fullydeveloped by the age of three. According to this theory, teenager behaviorslike risk-taking, a lack of sensitivity to how their actions ___23___ boththemselves and others, increased aggressive deeds, ___24___ concentration and anegative attitude were thought to be due to bad parenting or changes in bodychemistry. However, new technology has allowed researchers to examine the healthybrain at work. What they have discovered is something ___25___: Not only doesthe brain continue to grow beyond the age of three, but the research also ___26___that the brain of a teenager is larger than that of an adult. As teen brains are ___27___ with chemicals during adolescence phase, thebrain grows. However, only the cells that are used the most will ___28___ thecompetition within the brain. Those that are used less begin to die off untilthe brain reaches what will be its adult size. The way that teens spend their time ___29___ influences whichconnections remain and which disappear. On the basis of this knowledge, expertsadvise parents to be ___30___ on how their teenagers spend their time. Whatteens do today will affect their brains for the rest of their lives.A. diminishedB. demonstratedC. alertD. radicalE. surrenderF. surviveG. affirmsH. affordI. affectJ. effectK. soakedL. soapedM. sensitiveN. sensibleO. somehow

选词填空（15选10）    Teenagers are different from people of other age groups. The differences can be ___21___ from how they behave. In fact, the brains of teenagers are very different from those of children or adults.     Once people believed it was ___22___ that the human brain was fully developed by the age of three. According to this theory, teenager behaviors like risk-taking, a lack of sensitivity to how their actions ___23___ both themselves and others, increased aggressive deeds, ___24___ concentration and a negative attitude were thought to be due to bad parenting or changes in body chemistry.     However, new technology has allowed researchers to examine the healthy brain at work. What they have discovered is something ___25___: Not only does the brain continue to grow beyond the age of three, but the research also ___26___ that the brain of a teenager is larger than that of an adult.     As teen brains are ___27___ with chemicals during adolescence phase, the brain grows. However, only the cells that are used the most will ___28___ the competition within the brain. Those that are used less begin to die off until the brain reaches what will be its adult size.     The way that teens spend their time ___29___ influences which connections remain and which disappear. On the basis of this knowledge, experts advise parents to be ___30___ on how their teenagers spend their time. What teens do today will affect their brains for the rest of their lives. A. diminished B. demonstrated C. alert D. radical E. surrender F. survive G. affirms H. afford I. affect J. effect K. soaked L. soaped M. sensitive N. sensible O. somehow