Questions 1 to 5 are based on an interview. At the end of the interview, you will be given 10 seconds to answer each of the following 5 questions.
Now listen to the interview. In this special school, how many children usually are there in a class

A．The old man had very poor vision.
B．The old man’ s wife had an eye problem.
C．The old man failed to see what be should have seen.
D．The old man’ s wife was not easy to recogniz