Dr. Moorhead is studying __A___13____ our biological clocks affect the way we do our work2. For example, most of us have great difficulty if we must often change to different work hours. ___B__14____ can take3 many days for a human body to accept the major change in work hours. Dr. Moorhead said industrial officials should have a better understanding of biological clocks and how they affect workers. He said __C__15____ understanding could cut sickness and accidents at work and would help increase a factorys production.

　　1. A) scientists B) humans C) plants D) animals

　　2. A) insects B) birds C) fish D) snakes

　　3. A) effect B) affect C) effected D) affected

　　4. A) because B) for the reason that C) because of D) since

　　5. A) months B) days C) minutes D) weeks

　　6. A) flight B) fly C) movement D) transportation

　　7. A) prevented from B) ordered by C) helped by D) intruded on

　　8. A) and B) but C) therefore D) however

　　9. A) portions B) parts C) sections D) kinds

　　10. A) try B) tries C) seem D) seems

　　11. A) things B) parts C) cells D) actions

　　12. A) awaken B) wake C) awakening D) wake-up

　　13. A) how B) why C) where D) what

　　14. A) We B) It C) They D) You

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