单选题 Wang Boxuan and his schoolmates keep and sell used exercise-books.

单选题 If you want to learn Paper Cutting, you can go to Building 3 Room 501.

单选题 If you are busy on this Sunday afternoon, you can't go to Chinese Knot Club.

单选题 World Environment Day is on July 5th.

单选题 Sky Lanterns are made of bamboo and paper.

单选题 All the students have joined in the activity, collecting over 87 tons of waste paper.

单选题 Sandstorms are harmful to Beijing.

单选题 The money made from the sales is used to help poor students.