53. Which of the following titles best describes the main idea of this passage?
(A) The Origin of Lullabies
(B) The Functions of Lullabies
(C) Threatening Lullabies
(D) Sleep-Inducing Lullabies

49. Which of the following is closest in meaning to “arid” in the first paragraph? (A) Occupied. (B) Isolated. (C) Dry. (D) Remote.

50. What is the second paragraph mainly about? (A) The high cost of desalinating seawater. (B) The major chemical characteristics of seawater. (C) The urgent need to turn seawater into fresh water. (D) The amount of energy produced in the desalination of seawater.

51. According to the passage, which of the following statements is true? (A) Mixing salt with water is not as easy as removing salt from seawater. (B) Desalinating seawater may kill some sea creatures and disturb the food chain. (C) Covering 70% of the Earth, the ocean has always satisfied human needs for water. (D) The increasing population in Saudi Arabia has resulted in shortages of fresh water.

52. Which of the following best describes the author’s attitude toward the future of desalination? (A) Amazed. (B) Doubtful. (C) Conservative. (D) Hopeful.

54. Which of the following is closest in meaning to the word “undertones” in the first paragraph? (A) Consequences. (B) Vocals. (C) Whispers. (D) Messages.

55. What does the author use to support the idea that lullabies can have a soothing effect? (A) Research reports. (B) Examples found in history. (C) Stories of caretakers. (D) The author’s personal experiences.

56. According to this passage, which of the following statements is true? (A) Scary lullabies better help babies fall asleep. (B) Mothers prefer to sing lullabies with a joyful melody. (C) Lullabies comfort not only the baby but also the mother. (D) Babies react to both the music and the lyrics of lullabies.

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