课时规范训练(三十三)
Ⅰ.阅读理解
A
(2017·四川成都诊断)From sleeping standing up to shutting down half of their brain，animals have some strange sleeping habits.
Now some of these unusual habits, from napping giraffes to birds that sleep while flying, have been shown in a chart. This chart shows that little brown bats are very lethargic,_sleeping for around 19.5 hours per day.
This long period of sleep is thought to be a way of conserving energy and it means brown bats only hunt for a few hours each night when their insect food is available.
In contrast, giraffes can go weeks without sleep because these large and slowmoving animals
