In the fourth paragraph, the pronoun "it" refers to which of the following

* Hướng dẫn giải

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 daytim