If their habitat is threatened or they can't find enough food.their numbers may decrease．题目和参考答案——青夏教育精英家教网—

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

分析如果他们的栖息地受到威胁或者他们找不到足够的食物，他们的数量就可能会下降．

解答答案：decrease．
根据前面if引导的条件状语从句可知，栖息地受到威胁或者找不到足够的食物就有可能导致数量下降；故答案为decrease．

点评首字母填空题考查的是词汇的记忆和运用能力，平时要注意积累和运用．同时还要注意提示字母．

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