How many books are on the shelf?

书架上有多少本书？

同一单元的其他句子

• The black cat slept on the clean blanket.黑猫睡在干净的毯子上。
• Please bring the fresh bread to the table.请把新鲜的面包拿到桌子上。
• The small clock ticks loudly in the quiet room.小钟在安静的房间里大声滴答作响。
• Can you spell the word 'crack' correctly?你能正确拼写单词'crack'吗？
• The frog jumped from the green leaf to the log.青蛙从绿叶跳到木头上。