4 Listen to a conversation between Meiling and her dad. 听美玲和爸爸的一段对话。
4-1 Complete the notes with no more than three words for each blank. 补全笔记，每空格最多三词。
Topic: Light pollution
Cause:
• Man-made lights such as (1) , billboards and building lights shine upward and create a glow that (2) .
Effects on wildlife:
• Birds (3) by bright city lights and some of them (4) and get h or killed.
Solutions:
• Some cities require that shops (5) late at night.
• Outdoor lights should (6) so they shine downward.
• People should turn down the lights or use motion sensors.
Conclusion:
• Every (7) can help bring back a dark, clear night sky.

(1) street lights (2) covers the stars (3) get/are confused (4) fly into buildings (5) turn off lights (6) be covered (7) small action

🎧4-2 Listen again and answer the questions. 再听一遍对话，回答问题。
(1) What made Dad start the conversation about light pollution?

(2) Do you think light pollution is a serious problem in your city? Why or why not?

(Answers may vary.)
(1) They could hardly see any stars in their city at night.
(2) Yes, I do. I can only see a few stars in my city at night. Many advertising boards stay lit all night with extremely bright lights, and they make it hard for us to see the stars clearly.

Update my to-do list (Student’s Book, page 85)
Numbers
Effects of air pollution on health
$PM_{2.5}, around (1) $ smaller than a human hair
People breathe in these tiny pieces and of them (2) .
(3) dollars per second
People spent it on economic and (4) .
second
B

(1) 30 times (2) get killed (3) Over 9,000 (4) health care expenses