A:{x | 1<x≤2}
B:{x | 1≤x<2}
C:{x | 1≤x≤2}
D:{x | 1≤x≤3}
It will be 20 years since Hong Kong returned to China on July 1,1997.(就划线部分提问)
____ ____years will it be since Hong Kong returned to China on July 1, 1997?
观察黑藻叶片细胞时,能看到缓慢流动的是( )