C.The crested ibis is now free from the threat of extinction.
D.Most of the crested ibis are in Shaanxi province.
51. Which of the following can best explain the underlined word “Ornithologists”?
A.the persons who study the birds
B.the persons in the State Forestry Administration
C.the persons who keep the birds
D.the persons who kill the birds
52. Why did the experts adopt the way of inbreeding to protect the crested ibis?
A.To increase the death rate.
B.To increase the number of the crested ibis.
C.To get more physical defects for hatched chicks
D.To have the lowest diversity of the endangered bird.
53. What may be the reason for the reduction in the population of the crested ibis before 1981?
A.inbreeding B.economic development
C.over hunting D.sandstorm
54. What can we learn from the passage?
A.Due to our great efforts, the crested ibis lives in the wild well.
B.Scientists will choose a better habitat for the crested ibis.
C.The problems of the crested ibis have not been solved now.
D.The government has established a genetic database of the crested ibis.
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