2、在活动中自我锻炼和培养。提高听、说、读、写等方面的能力。
（五）教学实施过程
Step1 Revision
Revise the words: chemical, experiment, observe and observation
Step2 pre-reading
SB Page22 Part1. Discuss the oral homework by asking the class the questions in part1. Continue discussing until they show an understanding of the meaning of observation and observing.
Step3 Presentation: Refer to the picture at the top of Page22. Ask students questions about the picture.
Step4 Reading
Answer the question: How did the students feel after they tasted the mixture?
Step5 Practice
Wb Lesson16 Ex.1
Step6 Workbook
Wb Lesson18, Exx2 and 3
Step7 Consolidation
Discuss about the question: What can we learn from this lesson?
Step8 Homework
Write what they can learn from this lesson.
教学实录
（一）Warming up
（二）Revision
T: Do you still remember the words what we learned in Lesson17?
(The teacher writes words on the Bb: chemical, experiment, observe and observation)
Ss: Read together.
T: Do you know which word “observation” comes from?