问题 单项选择题

某植物水浸液,加三氯化铁呈绿黑色,加明胶有白色沉淀,与稀硫酸共煮,有暗红色沉淀,表明植物可能含下列哪类成分

A.蛋白质

B.有机酸

C.鞣质

D.黄酮

E.皂苷

答案

参考答案:C

选择题
填空题

短文填词。

     Like most of my schoolmates, I have neither brothers nor

sisters-in other   1   , I am an only child. My parents                                                      

love me ly of course and will do all they    2    to make sure                                            

that I get a good   3   (教育). They do not want me to do                                           

any work at home; they want me to d   4    all my time to                                              

my studies so that I'll get good marks in all my    5   (科目). We                                  

may be one family and live  6    the same roof, but we do                                           

not seem to get much time to talk  7    (一起). It looks                                                  

as if my parents t   8   me as a visitor or a guest.                                                         

Do they really u  9     their own daughter                                                                 

What things are in other families, I w  10   .