Which of the following teaching objectives does not refer to “language understanding”? （ ） A Understand that the 'ea' pattern has several sounds in English. B Know “be going to” could be used to describe actions, behaviors and events which are to happen in the future. C Tell the meaning of the following words: big, small, long, short, strong. D Understand people from different countries have different ways of greeting and show respect for each other’s custom.