表情动作和语言不同，它不是人际交往的工具。
参考答案：错
解析：表情动作与语言一样是人际交往的重要工具.
Our class ______ the biggest in Grade Three and our class ______ all crazy about pop music.
A．are; is
B．are; are
C．is; are
D．is; is
当CRH1A型动车组总风管压力达到（）kpa才能向空气弹簧进行供风。
A.600
B.670
C.800
D.1000
