20. What does the passage mainly discuss? (A) The history of surveys in North America (B) The principles of conducting surveys (C) Problems associated with interpreting surveys (D) The importance of polls in American political life

19. The author mentions twenty percent in line 23 to indicate that (A) eagles are twenty percent bigger than most birds (B) twenty percent of all nests include foundation branches (C) the nests of eagles are twenty percent of larger than those of other birds (D) birds can carry twenty percent of their own weight

20. What does the passage mainly discuss? (A) The history of surveys in North America (B) The principles of conducting surveys (C) Problems associated with interpreting surveys (D) The importance of polls in American political life

其他試題

20. What does the passage mainly discuss?
(A) The history of surveys in North America
(B) The principles of conducting surveys
(C) Problems associated with interpreting surveys
(D) The importance of polls in American political life