由CH₃CH₂CH₂OH制备CH₂—CHCH₃，所发生的化学反应至少有(　　)

①取代反应　②消去反应　③加聚反应　④酯化反应

⑤还原反应　⑥水解反应

A．①④⑥

B．②③

C．②③⑤

D．②④

A．A trade Show of the latest sporting goods is on display.

B．An event for team sports is held with the country’s best athletes.

C．A spring market fair for cutting equipment and accessories is opera

D．A business rendezvous is scheduled between VIPs and the best athletes.