A:Having a talk with the student
B:One talk with the student
C:Given a talk with the student
D:If you have a talk with the student
人在恐惧、紧张时,肾上腺髓质释放的肾上腺素增多,该激素可作用于心脏,使心率加快.下列叙述错误的是( )
小明将一正方形纸片画分成16个全等的小正方形,且如图所示为他将其中四个小正方形涂成灰色的情形.若小明想再将一小正方形涂成灰色,使此纸片上的灰色区域成为线对称图形,则此小正方形的位置为何?( )