Read the passage below and choose the best answer for each question.
Miss Richards was a teacher at a school in England. She taught chemistry and physics from the lowest to the highest classes in the school. Sometimes the new classes learnt quickly , but sometimes they were very slow, and then Miss Richards had to repeat things many times. One year , the first class had studied chemistry for several weeks when Miss Richards suddenly asked : “ What is water?” . There was a silence for a few seconds, and Miss Richards felt sad , but then one of the boys raised his hand. He was not one of the most intelligent students in the class, so she was glad that he could answer “ Water is a liquid which has no colour until you wash your hands in it,” the boy replied.
Which of the following statements is NOT true about Miss Richards?
A.Her question in the passage was in chemistry.
B.She taught natural science subjects.
C.Her new class sometimes learnt very slowly.
D.She only taught the highest class.