[原题呈现]有趣的一次实验。这学期科学课上老师做了不少实验,你觉得最有趣的是哪一次?有趣在哪里?(苏教五上“习作7”)今天科学课上,老师和我们做了一个小实验:石头是怎样变成沙子或沙土的。我们拿出准备的材料——小石块、水、酒精灯等。老师先叫两个同学拿来几块小石头,然后用烧杯装了一大杯水,放在桌子上备用。老师选了一块稍 [Original presentation] An interesting experiment. This semester science class teacher did a lot of experiments, what do you think is the most interesting? Where is the interest? (Sujian five “practice 7 ”) today science class, the teacher and we did a small experiment How the stones turn into sand or sand. We come up with the prepared materials - small stones, water, alcohol lights and so on. The teacher first asked two classmates to bring in a few small stones, and then put a large glass of water with a beaker on the table. The teacher selected a slightly