The writer compares turtles to mountain climbers
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
正确答案：B
第三段他们拖着沉重的身体慢慢地爬行如同爬山一样可以想象其艰苦
