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In recent years, researches have suggested more health value from vitamin D than had once been thought.
Vitamin D is (62) naturally in the is a (63) source. It is also found in some foods. Vitamin D helps to increase levels of calcium in the blood. It helps build strong bones and teeth.
It also (64) to do more than just protect against rickets (软骨病). That serious bone disease was the reason why vitamin D was added to milk. Rickets is now (65) in the western world. But it is still a common childhood disease in developing countries. Rickets can and is also (66) to cause bone pain and weakness, teeth problems and muscle (67)
According to the study by the Harvard School of Public Health, Vitamin D might protect against multiple sclerosis (硬化症), also called MS.
MS is a (68) disease of the central nervous system that (69) about two million people around the world. There is no (70) . The level of severity can differ from person to person. But is usually seriously disabling.
The study iii Boston found that people with higher levels of vitamin D had lower (71) of MS. It found that the chance of developing MS was sixty-two percent lower among those with the highest level of vitamin D (72) those with the lowest level.
Vitamin D may become a future (73) for MS. But, he says first scientists must carry (74) a large, controlled study in which some people get vitamin D and others (75) not.
This is not the first study to show a possible (76) between vitamin D and multiple sclerosis. But it has (77) the clearest evidence of a direct (78) . The National Institutes of Health says some studies also suggest vitamin D (79) protect against some kinds of (80) . But it says more human studies are needed to learn if a lack of vitamin D (81) the risk of cancer.
62. A) made B) produced
C) created D) manufactured
63. A) major B) minor
C) most D) surplus
64. A) shows B) appears
C) looks D) appeals
65. A) common B) popular
C) rare D) usual
66. A) added B) subjected
C) owned D) reducted
67. A) loss B) lack
C) insufficiency D) shortage
68. A) slow B) gradual
C) progressive D) tardy
69. A) effects B) affects
C) impacts D) suffers
70. A) cure B) solution
C) curl D) curse
71. A) levels B) rates
C) rites D) interests
72. A) than B) then
C) and D) as
73. A) danger B) way
C) method D) treatment
74. A) in B) out
C) about D) on
75. A) do B) get
C) make D) gain
76. A) difference B) relative
C) relationship D) combination
77. A) refused B) provided
C) promoted D) denied
78. A) combination B) touch
C) contact D) link
79. A) may B) should
C) can D) must
80. A) cancer B) fever
C) cold D) flu
81. A) rises B) decreases
C) increases D) improves
