Unit 4,Part A. 1: About 300000 2: In reading and math 3: interests, questions 4: outsider, mixing with, well qualified, narrow views 5: time, desire,Part B. 1: snowfall, climate, Alaska, tourism 2: spring, stars, telescope, satellites, space 3: dinner, atlas, influence, greenhouse, deserts, ice caps,Part A 1: everything 2: fair idea, want to do 3: competent, narrow, one thing 4: beginning, lose years,Part B 1: depth, general, wide 2: 90% 3: pure, technical, scientific, academic, practical use 4: flexible, switch 5: far more, prepared,new skills,Part IV,1：to equip 2：require 3：shock 4：apart 5：true 6：get to know 7：live together 8：compare 9：male 10：female 11：healthy attitude 12：mysterious creatures 13：romantic heroes 14：physical 15：emotional,