When I ask him to point to pictures of particular scenes, he could pick out which scene matched the sentence当我要求他指出特定情景的图片时，他能够挑选出附合描述的图片

ask to邀请(某人)参加(某活动)

We must ask you to amplify your statement.

我们得请你对你的说法作进一步的说明。

Immigration officials will ask to see your papers.

移民局的官员将要求你出示证件。

pick out挑出；辨认出

My father helped me pick out a new book.

我父亲帮我选了一本新书。

Let me pick out some good ones for you.

让我来替你挑几个好的。

So he did very well on that task.而他完成得很好

do well 做得好； 进展情况良好

You would do well to discuss the matter with him.

你还是与他商量一下这件事为好。

You have to be highly competitive to do well in sport nowadays.

如今必须有高度的竞争意识才能在体育运动中取胜。