Winter is the time when bugs (虫子) invade your house without an invitation. The season can be tough for such creatures. In winter the air is cold, the ground is hard and many trees have no leaves. So bugs do what they have to do to survive.

　　Monarch butterflies head south to warmer climates. Ants crowd in deep underground colonies and eat food they have been storing all year. Many insects go into a deep sleep called diapauses. There’ re different kinds of diapauses, but all are similar to hibernation, a time when bigger animals become inactive in the cold. Insects go into an inactive period, too, but it often isn’ t when the temperature drops.

　　They rely on more dependable signals in the environment. For example, many insects can tell how much sunlight there’ s each day. They use that to tell themselves when to shut down. Bugs are cold-blooded, meaning that their inside temperature is the same as the outside. They can’ t move much when it gets below 40 degrees Fahrenheit. So they search for any warm place.

　　They’ re looking for protection. These guys have been doing this for 300 million years, so they don’ t really know they’ re coming into your house. The home is a recent event in terms of their evolutionary behavior. They enter through tiny cracks or come in unnoticed on your clothes or shoes. Remember that they may be invading your homes for warmth and food, but they don’t care about humans.

【2016届高考英语二轮专题总复习精选综合能力专练：完形填空1】相关文章：

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（5）及答案

★ 2015-2016高考英语二轮复习常见的七大误区

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修5 Unit 3 Life in the future

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (43)

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（19）及答案

★ 2014届高考英语一轮复习选修8参考答案（外研版）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (23)

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修6 unit2《Poems》

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修2 Unit 1 Cultural relics

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修6 unit4《Global warming》