Human beings, too, 37 special devices to protect 38 .
答案：(C) themselves
themselves 反身代名詞對應前面複數主詞 Human beings；himself（單數陽性）、itself（單數）、yourselves（第二人稱）都不匹配主詞。
本題大考中心未公布逐題答對率，以下不談數據，只談觀念。
四個選項都是反身代名詞，長得都很像，如果沒回頭確認主詞是誰、是單數還是複數，很容易隨手挑一個。這一格只要找到主詞就結束了。
四個選項都是反身代名詞，可見這一格考的是它要跟哪一個主詞對應。先找主詞：Human beings, too, {37} special devices to protect ___。主詞是 Human beings（人類），是第三人稱複數，所以反身代名詞要用 themselves。反身代名詞的規則很單純：跟主詞的人稱與單複數對齊——I 配 myself、you 配 yourself／yourselves、he 配 himself、she 配 herself、it 配 itself、we 配 ourselves、they 配 themselves。再用語意驗算：那些特殊的裝置是用來保護人類自己的，保護的對象與主詞是同一群人，所以才用反身代名詞而不是 them。
himself：第三人稱單數陽性，與複數主詞對不上。itself：單數，而且指的是事物，人類是複數也是人。yourselves：第二人稱，但這一句講的是「人類」這個第三人稱的群體，不是在對讀者說話。
protect oneself（保護自己）、help oneself（自行取用）、by oneself（獨自）、enjoy oneself（玩得愉快）、teach oneself（自學）、special devices（特殊的裝置）。
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.