C

    My family lives in London. In the morning, my father goes to work and we go to school. My father takes us to school every day. My mother stays at home. She does the housework. She always has lunch at home, and visits her friends in the afternoon. In the afternoon, we go home from school by bus. My father gets home from work late. At night my two brothers and I always do our homework. We go to bed at about ten. My father and my mother usually read newspapers. We can watch TV at the weekend.

有关实验的叙述，正确的是（　　）

  ____ ____ with Nancy ?

有一根长100米的空心钢管，甲同学在一端敲打钢管一下，乙同学在钢管的另一端可以听到 （  ）