必修第一册WelcomeUnit1.seniorhighschool(美国)高中2.atlast终于；最终3.makeanimpression留下好印象4.whatif要是会怎么样呢？5.concentrateon集中精力于6.leave...alone不打扰；不惊扰7.juniorhighschool(美国)初级中学8.lookforwardto盼望；期待9.takenotes记笔记10.flashcard教学卡片；识字卡Unit1TeenageLife1.prefer...to...喜欢多于2.cleanup扫除（或清除）干净3.suitablefor对适合的4.signup(forsth)报名（参加课程）5....
