試題詳解

47 According to the passage, which of the following statements is true?
(A) The alarm clock was patented by an American inventor in 1787.
(B) People continued to hire knocker-ups even after the alarm clocks were invented.
(C) In Britain and Ireland today, knocker-ups are still doing their jobs in industrial towns.
(D) During their morning patrols, police officers would watch out for knocker-ups’ safety.