题目

某有机物A的化学式为C6H12O2，已知A～E有如下图所示的转化关系，C能发生银镜反应而E不能则A的结构可能有 A．2种       B．3种       C．4种       D．8种 答案：B根据句意用括号内所给词的适当形式填空。1. Thank you for _____ (organize) the class trip. 2. This is the _____ (child) playhouse. 3. His brother _____ (study) English very hard. 4. —Whose is this sweater?    —It's _____ (he). 5. —What do you use to brush your _____ (tooth)?      —Toothbrush. 6. —Who _____ (cook) the meals in our home?    —My mother does. She is a very good cook. 7. —When is _____ (teacher) Day?     —On September 10th. 8. We are really _____ (excite) at the exciting news. 9. He is _____ (dress) up as a ghost. 10. Do you have _____ (some) books about Halloween?