1. 问答配对

⑴Are you crying?                   A. No. My eyes hurt.

⑵How do we use wood?                   B. We should plant trees.

⑶What should we do to make the air clean?       C. It's on 12th March.

⑷When's Tree Planting Day in China?     D. Because we need it to keep us alive.

⑸Why is the air very important?          E. We use wood to make beds.