39. The underlined word "subjects" refers to
(A) viruses
(B) humans
(C) ferrets
(D) mutations

35. Based on paragraph 2, which of the following items, if picked by the pigeons, will make the data of the experiment consistent? (A) a card with a big number four on it (B) a card with four purple circles on it (C) four diamond-shaped cards (D) four cards of different shapes and colors

36. In the third paragraph, the underlined word "which" refers to (A) the pigeon (B) the experiment (C) the card (D) the image

37. What may the researchers want to work on or to find out in future studies? (A) An improvement in collecting data (B) Possible applications of these findings (C) The difference between species (D) A source of this mental ability

38. Which characteristic of H5N1 is the biggest worry for epidemiologists?(A) its high mortality rate (B) its rate of spread(C) its ability to jump between species(D) its long dormant period

40. People not opposed to the publication of such research argue that(A) laboratory-made viruses are unlikely to survive in nature. (B) the usefulness of such knowledge outweighs any concern over bioterrorism.(C) causing a global pandemic is not what bioterrorists want to do.(D) scientists can test the effectiveness of the virus before it is released in nature.

41. In the article, the underlined word "classified" is closest in meaning to (A) undisclosed(B) categorized (C) controversial(D) hazardous

42. Which of the following statements might Michael Osterholm agree with?(A) Public objections to new technology are just normal panicked reactions.(B) Researchers have ultimate responsibility for the results of their research.(C) Advances in science still have to be made even though there are disputes and controversies.(D) Research projects can be abandoned if they cause more harm than good to the society.

43. Based on the examples in the first two paragraphs, which of the following words may be the LEAST perplexing to the writer's son?(A) heir(B) timid(C) elephant(D) tomb

44. In the second paragraph, the writer mentions "yacht, trough, colonel"(A) to serve as examples of words that sound differently than they are spelled(B) to show the progress her son has made in learning vocabulary(C) to explain that English words can be confusing due to their multiple meanings(D) to share her experience of teaching her son these strange words

45. Based on the article, the difficulty for a child to learn a language lies in(A) the number of commonly used words in a language.(B) the way a language is taught in the classroom.(C) the number of distinct sounds in the language.(D) the amount of exceptions in the language.