Jane a story book when her mother came into her bedroom.
A:read
B:was reading
C:reads
根据所学知识填空
下列说法错误的是( )
函数y= x−1 + 12−x 的定义域为____.
只用一种试剂就能将NaOH、NaCl、HCl三种溶液鉴别出来,它是()