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读懂课文内容。
Teaching procedures：
Step 1 创设情境，轻松导入：
1. Free talk：Play a game——put up some pictures of transportation on the blackboard.
2. Show four pictures of vehicles and ask the students to think about if our air is clean.
3. Show learning aims.
Step2 先学后教，设问导读：
Task 1: Listen to the tape and finish Let’s Do It! Part1 on page 93. Twice and then check their answers together.(通过听录音让学生初步感知课文大意。)
Jenny and Li Ming talked about different types of transportation over the next
____ years.
A. one hundred B. one thousand C. one million
2. Jenny would like to invent a _______.
A. hoverboard B. clean car C. backpack
3. Li Ming travelled across the city by ________.
A. bus B. bike C. train
Task 2: Read the whole passage and try to answer five questions. (自学课文，并回答下列问题，再次感知文本大意。)
1. What did Jenny’s teacher ask her and her classmates to think about?
2. How long did Li Ming pedal?
3. Does Li Ming hope that Jenny's presentation goes well?
4. What does “from now on” mean in Chinese?
5. What will cars probably use to power them in the future?
Task 3: Read the lesson again and fill in the blanks. You can discuss in your groups.（再读课文并放出声音，然后小组讨论完成短文填空，然后选一名代表发言。可参考课后练习第二题。）
This week, Jenny’s class discussed __________. They ________ about trains, planes, rockets and more. The teacher asked them to think about the future of transportation. They had to think of an invention and ________ it to the class. Danny gave a very interesting presentation. He ____ on an old backpack. He ____ on a chair and ________ down. He wanted to fly.
Step3 精讲点拨，疑难解答：
1. The teacher asked them to think about the future of transportation.
★考点： ask sb to do sth “要求某人做某事”
e.g: 我的老师要求我按时完成家庭作业。
My teacher asks me _____ _____ my homework on time.
think about 考虑
3. more than “超过，多于”=over