31-40題為題組
All forms of life have an instinctive urge to survive. Nature provides ( 31 ) with the means of survival. We have learned much about survival from ( 32 ) forms of animal life. Lizards, ( 33 ) can change the color of their skin and ( 34 ) the trees and leaves around them. ( 35 ) , they cannot be detected by other animals that threaten them. Nature provides other forms of protection ( 36 ) environmental dangers. Human beings, too, ( 37 ) special devices to protect ( 38 ) . Their skin is very ( 39 ) to temperature changes. ( 40 ) warm weather, sweating helps humans regulate their body temperature. 【題組】31. (A) it (B) them (C) this (D) which
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