choose指一般意義上的選擇.
例如：He advised farmers to choose the best seed-heads.他告訴農(nóng)民要挑選最好的穗（留種）.
select指“精選”,即有所淘汰.
例如：He looked through the suits and selected the cheapest one for me.他細(xì)細(xì)地翻看這些衣服,給我挑了一件最便宜的.
pick out相當(dāng)于“挑選出來”.并且,pick往往指比較容易的選擇,但pick out常指費(fèi)了心思或精力后才挑選出來的.
如:But by looking at the stages,we pick out a spacetime worm that makes up a person.
但看著這個(gè)階段,我們聯(lián)想到組成那個(gè)人的,時(shí)空蟲.