有机化合物A是天然蛋白质的水解产物,分子式是C9H11O2N。 经测定,分子结构中含有苯环但不存在甲基(-CH3)。化合物A的结构简式是________ ,当与氢氧化钠溶液反应时,A中参与反应的官能团是 ,当与盐酸 反应时,A中参与反应的官能团是 。
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.
The CDs are on sale! Buy one and you get ______ completely free.
I’m sure that your letter will get______ attention. They know you’re waiting for the reply.