【简答题】Do you know why different animals or pests (昆虫) have their special colors? Colors in them can protect (保护) them. Some birds like eating locusts (蝗虫), but birds can’t easily catch them. Why? It’s becau...
【单选题】Why can human beings outlast many faster four legged animals when running long distances? Perhaps because early humans evolved as hunters on the hot African savannas. Humans developed the ability to r...
A.
early humans typically hunted animals that were less well adapted than humans for long-distance running.
B.
early humans were only one of a number of species that hunted prey on the African savannas.
C.
early humans hunted mainly in groups by sneaking up on prey and trapping it within a circle.
D.
hunting was just as essential for later humans in colder climates as it was for early humans on the African savannas.
E.
human beings of today have retained the ability to run long distances but no longer hunt by chasing prey.