根据下面答案，回答120-121题&nBsp;
A．36Cm&nBsp;
B．40Cm&nBsp;
C．46Cm&nBsp;
D．50Cm&nBsp;
E．56Cm&nBsp;
120[单选题] 5岁儿童的头围约是&nBsp;
121[单选题] 3个月龄婴儿的头围约是&nBsp;