Why does the author refer to Gilbert White’s book in line 2?

23/50

To indicate that more research is needed in this field.

To show how attitudes have changed since1786.

To provide evidence that some birds are aware of quantities.

To contradict the idea that animals can count.

Giải thích

Đáp án C
Mục đích của tác giả là đưa ra một số dẫn chứng chứng minh rằng, các loài chim có sự nhận thức về số lượng: the naturalist Gilbert White tells how he surreptitiously removed one egg a day from a plover‟s nest , and how the mother laid another egg each day to make up for the missing one. He noted that other species of birds ignore the absence of a single egg but abandon
their nests if more than one egg has been removed