Even today press agencies still sometimes use carder pigeons to send messages between offices inlarge cities because the pigeons are not ______.

What is the author' s purpose in writing this passage A: To call on the readers to protect homing pigeons from extinction. B: To offer the reader information about homings pigeons and their training. C: To appeal to the owners of homing pigeons to set the birds free. D: To convince the reader it worthwhile to keep a homing pigeon as pet.

-Look at the flying pigeons in the sky._-You can’t imagine _____________ they played in the battlefields.

Scientists have found out how pigeons find their way home but they keep it as asecret.

Thephrase“ratswithwings”(Para.3)refersto_____. A: exoticrats B: devils C: strangebirds D: pigeons

Pigeons have a natural instinct to return home, ____ they are very far away and the trip is hard or dangerous.

In previous times， then fresh meat was in short ________， pigeons were kept by many households as a source of food.

Pigeons are thought universally as a ______ of peace. A: sign B: B. symbol C: C. symptom D: D. signal

西方情人节的象征物有哪些？ A: cupid B: roses C: Chinese knot D: pigeons

Pigeons can carry messages for about _____. A: two weeks B: four weeks C: two years D: four years