从A、B、C、D四个选项中选择能填入空白处的正确答案,并将其字母代号填入题前括号内.

从A、B、C、D四个选项中选择能填入空白处的正确答案,并将其字母代号填入题前括号内.
Is food important for us? The answer is YES. If we do not eat 51 , we will feel hungry. If we can not find food when 52 are hungry, we may feel very 53 . Maybe we can become sick, then die later.
Now we have another question. If we eat, what kind of food is 54 for us? Is meat better than vegetables and fruits? 55 are vegetables and fruits 56 than meat? For some people, it is very easy to answer this 57 . Vegetables and fruits are surely better than meat, because they 58 eat meat. For most of us, it is not very easy to decide on 59 is better. Doctors say it is not really important for us to decide on which is better, meat or vegetables and fruits, but it is taking a balanced diet of meat and vegetables and fruits that is the most 60 .
( )51. A. water B. milk C. food D. medicine
( )52. A. we B. you C. they D. people
( )53. A. calm B. bad C. happy D. quiet
( )54. A. good B. bad C. cheap D. expensive
( )55. A. Then B. But C. And D. Or
( )56. A. cheaper B. better C. more expensive D. more awful
( )57. A. problem B. question C. problems D. questions
( )58. A. always B. usually C. often D. never
( )59. A. which B. who C. why D. how
( )60. A. energetic B. popular C. important D. delicious