51. How did the writer feel halfway with the novel? (A)Disturbed. (B) Ashamed. (C) Cnfident. (D)Uncertain.

57.What is the key information the author wants to give in Paragraph 1? (A)Plants’ reaction to weather could have damaging effects on ecosystem. (B) The increasing speed of flowering is beyond scientists’ expectation. (C) Cimate change leads to the change of food production patterns. (D)Food chains have been seriously damaged because of weather.