42. According to the passage, why can dogs detect human illnesses?
(A) They rely on a very special sixth sense.
(B) They can see through the human body.
(C) They are good at reading human mind.
(D) They have a very sensitive sense of smell.

38. (A) saying (B) spoke (C) told (D) talking

39. (A) blank (B) empty (C) false (D) original

40. (A) Caused by (B) Depending on (C) In addition to (D) On behalf of

41. What is the main idea of the passage? (A) Dogs can learn to help the disabled. (B) Dogs can search for missing persons. (C) Dogs can identify diseases in humans. (D) Dogs can do tricks to entertain people.

43. According to the passage, how can dogs work as medical detection dogs? (A) They are born to run fast. (B) They need to receive training. (C) They like to imitate their owners. (D) They have a good sense of direction.

44. According to the passage, which of the following statements is NOT true? (A) Working dogs are helpful in tracking criminal activities. (B) Pet dogs are kept at work to take care of the sick people. (C) Trained dogs can detect lung cancer by smelling blood samples. (D) Dogs can identify certain cancers better than doctors using medical devices.

45. Which of the following inferences can be drawn from the passage? (A) Dogs can be trained for various purposes in our life. (B) Dogs have an unusual ability to tell right from wrong. (C) Dogs can replace the use of medical devices in hospitals. (D) Dogs have the ability to feel when people have depression.

46. What is the main idea of the passage? (A) Smoking and drinking alcohol do cause sleeping difficulties. (B) People must not smoke, drink wine or coffee before they sleep. (C) Drinking coffee before bed definitely causes sleeping problems. (D) The use of nicotine, alcohol, and caffeine should be recorded daily.

47. Where would this passage most likely be found? (A) A repair manual. (B) A business journal. (C) A health magazine. (D) A travel guidebook.

48. According to the passage, which of the following could be the weakness of this research? (A) The number of people participating in this study was not enough. (B) The amount of nicotine, alcohol, and caffeine consumed was not recorded. (C) The number of factors that could affect people’s sleep at night was not controlled. (D) The amount of time before bed the participants should consume nicotine was not shown.