47.A She has made up her mind to resign。
48.D Replace the shirt with one of
49.C They look at the world in a detached manner。
50.B Like it or not, you have to use them。
51.D The monopoly of British Railways。
52.D They lose a lot of money。
53.C Many coastal cities will be covered with water。
54.B How unstable the West Antarctic ice sheet is。
55.A The man is the manager of the apartment building。
56.B How the pictures will turn out。