When he was alive, the old scientist used to say that knowledge ______ from practice and he gained his experience by doing a lot of practical work

At the opening ceremony, the chairman ______ a speech to welcome the guests from more than twenty centuries.

It’s burning hot today, isn’t it?—Yes. __________ yesterday.

_____ that smells so good? It makes my mouth water.

填入下面文段空白处的词语，最恰当的一组是（ ）有的人在填报高考志愿时选报热门专业， 理由是能学以致用， ① 是一种误解。 学以致用的真正含义是将学到的知识用于实践， ② 不是看什么东西有用才决定去学。屏弃功利性 ③ 使人抱着乐观的态度去学习； ④ 有用才去学习会使人产生心理负担， ⑤ 总要担心以后会不会真的有用 。 抱着功利之心去挑选专业， 往往会牺牲自己真正的兴趣， ⑥ 毕业后谋到了不错的职位，也不一定就工作得很开心。 ①②③④⑤⑥