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.
16. What is the purpose of the first paragraph?
A. To point out that humans like to stay at home in winter.
B. To mean that humans and bugs have the same living habits.
C. To mean that bugs will invade humans’ houses for their winter.
D. To put forward the idea that bugs are not welcome in winter.
17.According to the text, what is diapauses?
A. It is the same as the animals’ hibernation.
B. It often appears in warm areas all the year.
C. It is done to keep bugs active in winter.
D. It is a deep sleep similar to hibernation.
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