完成句子：根据句意及汉语提示, 用词组的适当形式填空。（每小题2分）

小题1:We usually go to school                          (步行).

小题2:Mrs. Turner is always                          (对……严格要求) her child in all subjects.

小题3:There are many wild animals                          (处于危险中), such as pandas and tigers.

小题4:My parents both                          (同意) my decision.

小题5:Would you mind                          (关小) the radio, the baby is sleeping.

构成运算器的部件中，最核心的是（）。

A.数据总线

B.累加器

C.算术和逻辑运算单元

D.状态寄存器