choose : 普通用词，侧重根据个人意愿和判断从众多的对象中进行选择，着重被选者的优点。
- She had to choose between the two men in her life.
- Danny, come here and choose your ice cream.
- He chose a shirt from the many in his wardrobe.
- It's difficult choosing where to live.
- I've chosen a present for Luis.
- UK I've chosen Luis a present.
- Yesterday the selectors chose Dales as the team's new captain.
- The firm's directors chose Emma to be the new production manager.
select : 书面用词，具有庄严、正式的感情色彩。强调精选。
- There was a choice of four prizes, and the winner could select one of them.
- A mouse is a device which makes it easier to select different options from computer menus.
- How do you select people for promotion?
- He was selected to play for Australia at the age of only 18.
elect : 指按照一定的规章或法律，用投票等方式进行的认真慎重的选择。
- The President is elected for a four-year term of office.
- We elected him as our representative.
- She was elected Chair of the Board of Governors.
- The group elected one of their members to be their spokesperson.
pick : 口语用词，多指从个人角度仔细挑选，也含任意挑选之意。
- Pick a card from the pack.
- One of my sisters has been picked for the Olympic team.
- She was picked to play for the team.
- The police asked him if he could pick (out) the killer from a series of photos.
- The fairest way to decide the winner is to pick a name out of a hat/at random (= without looking or choosing).
- They picked their way (= carefully chose a route) down the broken steps.
- He's brilliant at picking winners (= choosing what will be successful).
prefer : 强调个人偏爱，不一定有选择的行动。
- Do you prefer hot or cold weather?
- I prefer red wine to white.
- He prefers watching football to playing it.
- I'd prefer not to discuss this issue.
- I'd prefer you not to smoke (= I would like it better if you did not smoke), please.
opt : 多指在几种可能性之间进行选择。
- Mike opted for early retirement.
- Most people opt to have the operation.