某有机物的结构简式为,它可以发生的反应类型有( )①取代 ②加成 ③消去 ④酯化 ⑤水解 ⑥中和 ⑦缩聚 ⑧加聚
My friend showed me round the town, ______ was very kind of him.
They use computers to keep the traffic _______ smoothly.
If you leave the club, you will not be_____back in .
What I need is_____ book that contains ______ABC of oil painting.
Jenny nearly missed the flight______ doing too much shopping.