三、语篇填空（共10小题，每小题1分；满分10分）
阅读短文，在空白处填入一个适当的单词或用括号内所给单词的正确形式填空，使短文通顺、连贯。
More than two hundred different 31.
types
(type) of owls live around the world.
Owls may seem dangerous, but the way they look and act 32.
helps
(help) them survive. Like most birds, owls can't move their eyes. However, they must turn their heads to follow 33.
a
moving object. Owls are able to turn their heads almost all the way around. They can even turn their heads upside down.
Owls' big eyes help 34.
them
(they) survive, too. Owls can't see in total darkness, 35.
but
they can see better in low light than others. That's because 36.
of
their pupils (瞳孔)—the black circles in the center of their eyes. Their pupils can grow large to let in more light.
Most owls 37.
mainly
(main) rely on their hearing to hunt. Most owls have huge ears with one higher than the other. The 38.
higher
(high) ear hears sounds from above while the lower ear hears sounds from below.
Many animals that owls hunt also 39.
have
(has) very good hearing.
So if an owl wants to eat, it attacks by surprise. The soft feathers that cover owls' bodies help them 40.
fly
(fly) without a sound.
