4．Only lately__________about the dark secrets behind the seemingly-happy marriage of the golf star Tiger Woods.

       A．the public have known    B．were the public known

       C．have the public known    D．the public knew

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Why don’t birds get lost on their long migratory (遷移的) flights? Scientists tried their best to find the   1   to this question for many years. The reasons have been discovered only lately.

　　  2   ago experiments showed that birds depend on the sun to guide them   3   . But what about birds that fly mainly by night?  4   with man-made stars have   5   that certain night-flying birds are able to follow the   6   in their long distance flights.

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1. A. reply           B. answer      C. discovery      D. replies

2. A. Not long        B. Long       C. Centuries       D. Years

3. A. during the night                B. during daylight hours

  C. in winter                     D. in the dark

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8. A. forest          B. cage         C. nest           D. cave

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10. A. time          B. place         C. way          D. season

11. A. to            B. towards       C. in            D. under

12. A. that          B. which         C. one           D. it

13. A. one          B. change        C. way           D. bird

14. A. caused        B. gave          C. resulted        D. meant

15. A. for           B. when         C. after           D. they are

16. A. ways         B. means         C. objects        D. homes

17. A. shown        B. covered        C. moved         D. hidden

18. A. areas         B. surface         C. marks         D. signs

19. A. far           B. high           C. dark          D. bright

20. A. helplessly     B. quickly         C. easily         D. freely

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Only lately        about the dark secrets behind the seemingly-happy marriage of the golf star Tiger Woods.

A．the public have knownB．were the public known
C．have the public knownD．the public knew

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Only lately        about the dark secrets behind the seemingly-happy marriage of the golf star Tiger Woods.

A．the public have known                   B．were the public known

C．have the public known                   D．the public knew

 

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Only lately         about the dark secrets behind the seemingly-happy

marriage of the golf star Tiger Woods.

   A. the public have known             B. were the public known

   C. have the public known             D. the public knew

 

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Only lately 　　　　 about the dark secrets behind the seemingly-happy marriage of the golf star Tiger Woods.

A. the public have known　 　　　　　　　 B. were the public known

C. have the public known 　　　　　　　 D. the public knew

 

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