The author mentions “kinglets” in line 7 as an example of birds that _____ A. protect themselves by nesting in holes B.nest with other species of birds C.usually feed and nest in pairs D.nest together for warmth
Đáp án đúng: D Giải chi tiết:Đáp án là D. Dựa vào ý ngay trước đó: Body contact reduces the surface area exposed to the cold air, so the birds keep each other warm. Two kinglets huddling together were found to reduce their heat losses by a quarter and three together saved a third of their heat.