题目

在下列各句的空白处填入一个最适当的词，使句子意思完整、语法正确。 1．His grandpa is __________. He can’t hear anything. 2．In e-mail English, a happy face is made with a colon and a right bracket __________ it. 3．You aren’t supposed to __________at others with your chopsticks. 4．---Thank you very much for helping me.     ---It’s my __________. 5．Li Yundi learned to play the piano by __________ at a very young age.下列哪组试剂在使用的过程中必须加热A．本尼迪特试剂在鉴定还原糖时B．苏丹Ⅲ染液在鉴定油脂时C．双缩脲试剂在鉴定蛋白质时D．碘-碘化钾在鉴定淀粉时