[00:03.89]Lesson 5 1 Dialogue
[00:09.64]Mr Zhu is showing the students of Class 4 the chemistry lab.
[00:16.30]Mr Zhu: Now,this is the chemistry lab.
[00:20.45]Have you been in this lab before? All:No.
[00:25.50]Mr Zhu: Ok,listen carefully,please.
[00:29.62]First of all,don't come in here without a teacher.
[00:33.38]That's not allowed.Once you're in here,listen to your teacher.
[00:40.15]Do what he or she tells you to do.
[00:44.09]Follow your teacher's instructions.
[00:47.86]Don't touch anything unless your teacher tells you to.
[00:52.82]When you have finished your experiment,
[00:56.66]please tidy the lab and put everything back in the cupboards.
[01:02.12]Do you all understand? Yes.
[01:06.66]What about when we leave?
[01:10.14]That's very important.
[01:13.48]Before you leave the lab,
[01:16.83]make sure the electricity is turned off and the windows are shut.
[01:22.99]Finally,turn off the lights and lock the door.
[01:28.03]That's all.Any other questions?
[01:32.26]Are we allowed to use the basin by the side of the cupboard?
[01:36.99]Yes.Wash your hands with soap at the end of your experiment.
[01:47.94]Lesson 6 Reading
[01:52.30]Read this story to answer the question:
[01:56.74]How did the students feel after they tasted the mixture?
[02:02.20]LOOK CAREFULLY AND LEARN
[02:05.86]My friend Paul will never forget his first chemistry teacher.
[02:11.74]He was a little man with thick glasses,
[02:16.49]but he had a strange way of making his classes lively and interesting.
[02:22.94]And his lessons were not easily forgotten.
[02:27.30] Paul remembers one of his first lessons from this teacher.
[02:32.35]After the students were all in the chemistry lab,
[02:36.60]the teacher brought out three bottles.
[02:40.44]One was filled with petrol,one with castor oil and one with vinegar.
[02:47.42]"Now watch carefully,"said the teacher.
[02:51.68] He then filled a cup with some of the petrol,some of the castor oil
[02:57.92]and some of the vinegar.
[03:01.16]As the students watched him quietly,
[03:05.13]he mixed the three together.
[03:08.68]After that,he held up one of his fingers and showed it to the class.
[03:15.21]He then dipped it into the cup.
[03:18.97]After a few seconds he took his finger out.
[03:23.94]"Now watch,"he said."Remember,you must do everything as I do."
[03:31.10] He put a finger in his mouth,tasted it and smiled,looking rather pleased.
[03:38.64]Then he handed the cup around the class of students.
[03:43.92]Each student dipped a finger into the mixture and sucked it.
[03:49.17]Instead of smiling,each of them made a face.
[03:54.14]The mixture tasted terrible.
[03:57.98] When the cup was at last returned to the teacher,he said sadly,
[04:03.93]"I'm sorry,none of you watched carefully enough.
[04:08.89]Yes ,I sucked a finger,but the finger I put into my mouth
[04:15.14]was not the one I had dipped into the cup."
[04:19.81] It was Paul's first important lesson as a student of chemistry
[04:25.17]and he never forgot it |