单项选择题
A．many turtles die while swimming to shore B．female turtles protect their babies C．once turtles leave land, they never return to the sea D．the job of laying eggs takes tremendous strength
A．because they lay their eggs in mountain areas B．to give you a picture of how hard they work C．to tell you that they like to climb D．to tell you that mountain climbers are as slow as turtles
A．are very fierce B．hunt in large packs C．are very intelligent D．have unusually large litters