Usually a child’s behavior is a ________ of his family environment.

A．recognition

B．reflection

C．return

D．record

下列估测最接近实际的是

A．一支粉笔的质量为200g

B．一间教室的高度为3.5dm

C．人力三轮车的一般行驶速度为40m/s

D．一个鸡蛋的质量接近50g