题目

二甲醚和乙醇是同分异构体，其鉴别可采用化学方法及物理方法，下列鉴别方法中不能对二者进行鉴别的是（        ）     A．利用金属钠或者金属钾                 B．利用质谱法     C．利用红外光谱法                       D．利用核磁共振氢谱 答案：B 短文填词。 阅读下面短文,根据以下提示:1)汉语提示,2)首字母提示,3)语境提示,在每个空格内填入一个适当的英语单词；并将该词完整地写在右边相对应的横线上.所填单词要求意义准确,拼写正确. Sometimes you can learn more about what a person is trying tosay just by watching instead of l    . You might be talking to someone    about an idea you have. He might say that he's interested     your idea.   Just watch his face. Is he l      at you or are his eyes moving around,    just tired of w    you're saying ? It's important to watch other's body      language carefully because it provides a lot of useful       (信息).         Sometimes a person will be speaking too q    or use words that you      don't understand. If you pay attention to the     (信号)he is giving,      maybe you can still follow him, even   you're not sure of the meaning     of the words. This is especially    (有必要的)when watching TV or      in other situations       you can't ask the speaker to slow down.         1.______            2.______            3.______           4.______           5.______              6.______           7.______            8.______             9.______             10.______