請依下文回答第 21 題至第 25 題 My class in Brazil was scheduled from 10 until noon. Many students came late, some very late. Several arrived
after 10:30. A few showed up closer to 11. Two came after that. All of the latecomers wore the relaxed smiles that I
came, later, to enjoy. Each one said hello, and although a few apologized briefly, none seemed terribly concerned about
their being late. They assumed that I understood. Back home in California, I never need to look at a clock to know when the class hour is ending. The shuffling of
books is accompanied by strained expressions that say plaintively, “I’m starving….I’ve got to go to the
bathroom….I’m going to suffocate if you keep us one more second.” (The pain usually becomes unbearable at two
minutes to the hour in undergraduate classes and five minutes before the close of graduate classes.)When noon arrived in my first Brazilian class, only a few students left immediately. Others slowly drifted out
during the next 15 minutes, and some continued asking me questions long after that. When several remaining students
kicked off their shoes at 12:30, I went into my own “starving/bathroom/suffocation” routine. 【題組】22 How does the speaker know when the class hour is ending in California?
(A) By reading his watch. (B) By reading the class clock. (C) By reading his students’ expressions. (D) By reading the books.