听第四段对话,回答第13 ~15 小题。
()13. What did the girl do on June 5?
A. Exchanged unwanted things.
B. Collected waste paper.
C. Gave a report.
()14. Which bag did the president suggest taking?
A. A plastic bag.
B. A paper bag.
C. A reusable bag.
()15. What is the boy going to do next?
A. To tell his parents to use reusable bags.
B. To go shopping.
C. To recycle paper.

13.B 14.C 15.A

三、听短文，选择正确答案(短文读两遍)
()16. What is Earth's main colour from the space station?
A. Bright green. B. Bright blue. C. Bright white.
()17. Why does Earth look blue?
A. Because of its green continents.
B. Because most of it is covered by oceans.
C. Because of the white clouds.
()18. What do the green and brown areas stand for?
A. Oceans. B. Clouds. C. Continents.
()19. What is the "daylight line"?
A. A border between Earth's day and night parts.
B. A line of city lights at night.
C. A path of clouds around Earth.
()20. What do city lights look like from the space station?
A. A big red sun.
B. A glowing net.
C. A white cloud.

16.B 17.B 18.C 19.A 20.B