【正文】
a university have been doing sth.: “一直在做某事” ,表示從過去某時(shí)開始的某個(gè)動(dòng)作戒狀態(tài)一直延續(xù)到現(xiàn)在 ,而且還在進(jìn)行。Unit 5 Look into Science Lesson 28 The Study of Living Things Think about it! you like to be a biologist when you grow up? Why or why not? mysteries of nature do you know about? 未解之謎 [mist?riz] How to see solar system? butterfly ? 蝴蝶 a? What subject are they belong? biology ? 生物 ? a? ? migrate adj 遷徙的 a? migrating e? What it like? 奇異的 strange 230。 f