One of the earliest known birds with a beak and contour feathers, Confuciusornis sanctus, with large clawlike "thumbs" on its wings, which probably helped them to climb up to a launching position for flight.
-
Awith large clawlike "thumbs" on its wings, which probably helped them to
分析该选项
-
Bwith large clawlike "thumbs" on their wings, which probably helped it to
分析该选项
-
Chad large clawlike "thumbs" on its wings, which probably helped them
分析该选项
-
Dhad large clawlike "thumbs" on its wings, probably to help it
分析该选项
-
Ehad large clawlike "thumbs" on their wings, probably to help it
分析该选项