Question

— is your sister?—She is eight years old. A．How B...

— is your sister? —She is eight years old. A．How B．How old C．What D．Where

Answer 1

B
考查疑问词。How怎样，How
old
多大，What什么，Where在哪儿。根据答语内容She
is
eight
years
old.可知上文问的是年龄，故选B。