问题 单项选择题 A2型题

患者,女性,27岁,怀孕5个月,因牙龈肿物来院求治。检查见肿物位于左下前磨牙唇侧牙龈处,有蒂,呈椭圆形,探诊易出血。最有可能的诊断是()

A.牙龈瘤

B.黏液腺囊肿

C.纤维瘤

D.牙龈癌

E.血管瘤

答案

参考答案:A

解析:妇女在怀孕期间容易发生牙龈瘤,牙龈瘤与内分泌有关。

判断题
完形填空

Why don’t birds get lost on their long migratory (迁移的) 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.

  One such   7  , a warbler (鸣禽), had spent its lifetime in a   8  and had never flown under a natural sky. Yet is showed its   9  by birth to use the stars for guidance. The bird's cage was put under a man-made star-filled sky at migration   10 . The bird tried to fly   11  the same direction as   12  taken by other birds in the building. Any 13 in the position of the make-believe (虚构的) stars   14  a change in the direction of its flight.

  Scientists think that warblers,  15 flying in daylight, use the sun for guidance. But stars are clearly their important   16  of navigation(导航). What do they do when the stars are   17  behind the clouds? Clearly, they find their way by such land   18  as mountains, coastlines and river courses. But when it's too   19  to see these, the warblers circle  201  , unable to find out where they were.

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

4. A. Examinations    B. Labs       C. Tests           D. In the dark

5. A. been proved     B. found       C. been found      D. proved

6. A. stars           B. moon        C. route          D. sun

7. A. star            B. scientist      C. bird           D. flight

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

9. A. strength        B. ability        C. experience     D. practice

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