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    Cloze 20
   
    Do you find getting up in the morning so difficult that it’s painful? This  1  called laziness, but Dr. Kleitman has a new explanation. He has proved that everyone has a daily energy  2  .
   
    During the hours when you  3  your work you may say that you’re ‘hot’. That’s true. The time of day when you feel most  4  is when your cycle of body temperature is  5  its peak. For some people the peak comes during the forenoon. For  6  it comes in the afternoon or evening. No one has discovered why this is so, but it  7  such familiar monologues (自言自语) as: Get up John! You’ll be late for work again! The possible explanation to the trouble is that John is at his  8  and energy peak in the evening,  9  family quarrelling ends when husbands and wives realize  10  these energy cycles mean, and which cycle each member of the  11  has.
   
    You can’t change your energy cycle, but you can learn to make your life  12  it better.  13  can help, Dr. Kieitman believes. Maybe you’re sleepy in the evening but feel you must  14  late anyway. Counteract (对换) your cycle  15  by habitually staying up late than you want to. If your energy is low in the morning but you have an important job to do  16  in the day,  17  before your usual hour. This won’t change your cycle, but you’ll get up steam and work better at your low point. Whenever possible, do  18  work in the afternoon and  19  tasks requiring more energy or concentration for you  20  hours.
   
    1.    A. might be        B. must be        C. need be      D. can be
   
    2.    A. circle        B. recycle        C. cycle      D. crisis
   
    3.    A. go through    B. see through    C. break through    D. labour through
   
    4.    A. energetic        B. active        C. strenuous        D. idle
   
    5.    A. on      B. at      C. over      D. in
   
    6.    A. other      B. another        C. one another        D. others
   
    7.    A. owes to        B. leads to        C. leads into        D. attributes to
   
    8.    A. temper        B. thought        C. temperature        D. mood
   
    9.    A. Much        B. Many        C. Such      D. More
   
    10.    A. how      B. that      C. which      D. what
   
    11.    A. house        B. family        C. home      D. room
   
    12.    A. fit      B. adopt        C. like      D. look
   
    13.    A. Hobby      B. CharacteristicC. Interest      D. Habit
   
    14.    A. stay away    B. stay out      C. stay at      D. stay up
   
    15.    A. to extent        B. to some extent    C. to the extent        D. to an extent
   
    16.    A. early      B. daily      C. yearly      D. monthly
   
    17.    A. rise      B. raise      C. arise      D. arisen
   
    18.    A. usual        B. routine      C. normal      D. average
   
    19.    A. Keep      B. maintain      C. save      D. hold
   
    20.    A. clearer        B. harder      C. sharper      D. easier
   
    20. ACDAB  DBCAD     BADDB  AABCC