4．If their habitat is threatened or they can't find enough food，their numbers may decrease．

分析 如果他們的棲息地受到威脅或者他們找不到足夠的食物，他們的數(shù)量就可能會(huì)下降．

解答 答案：decrease．
根據(jù)前面if引導(dǎo)的條件狀語從句可知，棲息地受到威脅或者找不到足夠的食物就有可能導(dǎo)致數(shù)量下降；故答案為decrease．

點(diǎn)評(píng) 首字母填空題考查的是詞匯的記憶和運(yùn)用能力，平時(shí)要注意積累和運(yùn)用．同時(shí)還要注意提示字母．

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