第三篇

operation migration

41. whooping cranes migrate in winter to

a. find warmth and food

b. raise baby whooping cranes

c. get human help

d. lay eggs

42. whooping cranes are native to

a. north america

b. mexico

c. south america

d. the persian gulf

43. operation migration aims to

a. teach adult cranes how to fly

b. breed cranes in special parks

c. lead young cranes on their first trip south

d. transport cranes to the north

44. the distance covered by the young whooping cranes on their trip south is

a.120 miles

b.1931 miles

c.1200 miles

d.2000 miles

45. if operation migration is successful, whooping cranes will

a. learn to migrate on their own

b. follow airplanes south every year

c. live in canada all year round

d. be unable to fly back

參考答案：AACCA

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