fragment: ________ 2. ________: a . of or related to atoms 3. hypothesis:________ 4.________ : vt . make up 杜撰,创造 5.________ : v . give to a charity or good cause 捐赠;捐献 6. ________ : v . move a substance around with a stick in order to mix it together 搅拌 7. ________: v . imagine to be true or probable 怀疑 ; 猜想 8.________ : have as a result 造成 ... 结果,导致 9.________ : vt . obtain in pure form (使)离析 10. ________: vt . obtain by chemical or mechanical action 提取 11. ________: vt . propose as a candidate for an honor, position, duty, etc. 提名 12.________ : vt . remove impurities from, increase the concentration of sth. 净化 13. ________: start suddenly, sometimes violently 爆发;突发 14.________ : a . able to be carried or moved easily, esp. by hand 手提的,便携式的 15.________ : n . 暴露 16. ________: vt . give as an honor or reward 授予 17.________ : n . 属性;性质 18. ________ / ˌre ɪ d ɪəʊ 'ækt ɪ v / a . showing or caused by radioactivity 放射性的;放射引起的 19.________ / mæg'net ɪ k / a . able to attract iron or steel 有磁性 20. ________ / fli ː t / n . (车、船、飞机)队