4 Listen to the conversations and choose the best answer to each question. 听对话和问题，选出最恰当的答案。
(1) A. B. C.
(2) A. B. C.
(3) A. B. C.
(4) A. B. C.

(1) B (2) A (3) C (4) A

5 Listen to the passage and choose the best answer to each question. 听短文，选出最恰当的答案。
(1) How many children in Côte d’Ivoire can’t go to school for lack of classrooms?
A. Nearly 60,000.
B. About 15,000.
C. Around 1,600,000.
(2) What problems does the United Nations Children’s Fund (UNICEF) hope to solve?
A. Classroom shortage and plastic waste.
B. Water shortage and food waste.
C. Food shortage and air pollution.
(3) What are the plastic bricks produced by the factory like?
A. They are easy to make and break.
B. They are soft, colourful and cheap.
C. They are light, strong and waterproof.
(4) How much plastic waste does the factory recycle each year?
A. About 19 tons.
B. About 600 tons.
C. About 9,200 tons.
(5) What can we learn about this project?
A. It only works in African countries.
B. It solves problems in a smart way.
C. It helps countries develop faster.

(1) C (2) A (3) C (4) C (5) B