Directions: There are 20 blanks in the following passage. For each blank there are four choices marked [A], [B], [C] and [D] on the right side of the paper. You should choose the ONE that best fits into the passage. Then mark the corresponding letter on Answer Sheet 2 with a single line through the centre.
  Sugarless yoghurt (酸奶) could help beat bad breath, tooth decay and gum disease, say scientists. Japanese researchers found eating the yoghurt 62 levels of hydrogen sulphide (硫化氢) —a major 63 of bad breath — in 80% of volunteers. The 64 are active bacteria in yoghurt.
  Details were 65 at a meeting of the International Association for Dental Research. A (n) 66 of 24 volunteers who participated in the study were given strict instructions 67 oral health, diet and medicine taking. They spent two weeks 68 yoghurts and similar foods, like cheese. Researchers then 69 bacteria levels and odor-causing compounds,70 hydrogen sulphide. The volunteers then ate 90 grams of yoghurt a day for six weeks.
  At the end of the study, researchers took 71 again. They found hydrogen sulphide levels 72 in 80% of participants.
  Dr. Nigel Carter, chief executive of the British Dental Health Foundation, said: "The foundation has long been 73 people's attention to sugar-free yoghurts as a healthy snack, so it is pleasing to hear that it may have oral health benefits we were previously 74 of. "
  "Although this research is still in the early stages there is no 75 that sugar-free yoghurts provide a much healthier 76 to sweets and chocolate, and we would encourage snackers to 77 them into their diet. "
  78, Dr. Carter stressed that the best way to beat bad breath was by 79 a good oral health routine. This involves brushing twice-a-day with fluoride ( 氟化物 ) toothpaste, cutting 80 on the frequency of sugary snacks and drinks and visiting a dentist 81.
  62. [A] increased [B] required
  [C] averaged [D] reduced

  63. [A] reason [B] cause
  [C] result [D] origin

  64. [A] strategies [B] matters
  [C] keys [D] emergencies

  65. [A] presented [B] submitted
  [C] exposed [D] written

  66. [A ] whole [B] unit
  [C] total [D] amount

  67. [A] with [B] of
  [C] to [D] on

  68.[A ]avoiding [B] prohibiting
  [C] preventing [D]refusing

  69. [ A]balanced [B] evaluated
  [C 1 measured [D] counted

  70.[A] involving [B] including
  [C] containing [D] concerning

  71. [A ] modes [B] examples
  [C] copies [D] samples

  72. [A ] grew [B 1 remained
  [C 1 decreased [D] risen

  73. [A] drawing [B] paying
  [C] attracting [D] concentrating

  74. [A] uncertain [B]unaware
  [C] certain [D 1 aware

  75. [ A]idea [B] hesitation
  [C] doubt [D] sense

  76. [A ] selection [B] alternative
  [C] preference [D] substitute

  77. [A] convene [B] affiliate
  [C] constrain [D] incorporate

  78. [A ] However [B] Moreover
  [C] Therefore [D] Otherwise

  79. [A] bringing [B] adopting
  [C] receiving [D] adapting

  80. [A] off [B] back
  [C] out [D]down

  81. [A] regularly [B] occasionally
  [C] rarely [D] normally
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