The author mentions all the following as examples...

D

- Hướng dẫn giải

Dẫn chứng:

So most of them pass the burning hours asleep in cool, humid burrows underneath the ground, emerging to hunt only by night. The surface of the sun-baked desert averages around 150 degrees, but 18 inches down the temperature is only 60 degrees.

Its population is largely nocturnal, silent, filled with reticence, ....

Đáp án D là không đề cập đến.