The author mentions all of the following at tributes that enable a homing pigeon to return home EXCEPT ____________________. A. instinct B. air sacs C. sen

Đáp án B

Trong đoạn 4, đại từ “it” ám chỉ đến cái nào sau đây?

Radar                                                                                           Bird: chim bồ câu

Loft: lông chim                                                                              Form: hình dạng

Dẫn chứng: Some homing pigeon experts claim that this bird is gifted with a form of built-in radar that helps it find its own loft after hours of flight, for hidden under the head feathers are two very sensitive ears, while the sharp, prominent eyes can see great distances in daytime.