31．The author suggests that the Human Genome Project can cause ________.

　　A．the policy makers to feel very worried and careful

　　B．the scientists to work harder

　　C．many people to find work easily

　　D．a lot of companies to produce many new drugs

　　答案　B　[判断题。从文章内容可知，人类基因组图的完成将有助于科学家们攻克一系列难关。所以，他们在更努力地探究。]

　　D

　　Owls (猫头鹰) are mysterious creatures.We often think of them as scary.They sometimes live in abandoned houses.They fly without a sound through backyards at night.In stories, they appear with ghosts.When we hear an owl's familiar “wh­ooo...whooo...”，it can make us feel very frightened.Owls fly silently, without even a whisper of wings moving through the air.It's as though they appear out of nowhere—like ghosts on wings.Owls fly and hunt on the darkest of nights.An owl's night habits make it unique.Do these creatures of the night possess strange powers?

　　Owls possess unusual powers of sight and hearing, but they are not supernatural powers.They are natural adaptations that let them live most efficiently (高效地) at night.There is no reason to fear owls.Their habits make them helpful to humans.By hunting mice and other rodents (啮齿目动物)，owls help to keep a natural balance between plant and animal life.Without owls, there would be a large number of rodents in farmers' fields and storage barns.

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