I took someone else’s book（ ）mistake.
A.in B.for C.with D.by
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1.The author mentions all the following natural phenomena that help animals navigate EXCEPT （）.2.What makes it necessary for a bird to rely on a magnetic compass when navigating?3.According to the passage what information does the dance of the scout bee communicate to the other worker bees?4.What enables the bees to fly by the sun even though the sun’s position is not fixed?
'>Researchers have found that migrating animals use a variety of inner compasses to help them navigate. Some direct themselves by the position of the sun. Others navigate by the stars. Some use the sun as their guide during the day, and then switch tn star navigation by night. One study shows that the homing pigeon uses the Earth's magnetic fields as a guide in finding its way home, and there are indications that various other animals, from insects to mollusks, can also make use of magnetic compasses. It is of course very useful for a migrating bird to be able to switch to a magnetic compass when clouds cover the sun; otherwise it would just have to land and wait for the sun to come out again.Even with the sun or stars to guide by, the problems of navigation are more complicated than they might seem at first. For example, a worker honeybee that has found a rich source of nectar and pollen flies rapidly home to report. A scientist has discovered that the bee sent out to look for food delivers her report through a complicated dance to the other workers not only how far away the food is, but also what direction to fly in relation to the sun. But the sun does not stay in one place all day. As the workers start out to gather the toed, the sun may already have changed its position in the sky somewhat. In later trips during the day, the sun will seem to move farther and farther toward the west. Yet the worker bee seem to have no trouble at all in finding the food source. Their inner clocks tell them just where the sun will be, and they change their course correspondingly.
1.The author mentions all the following natural phenomena that help animals navigate EXCEPT （）.2.What makes it necessary for a bird to rely on a magnetic compass when navigating?3.According to the passage what information does the dance of the scout bee communicate to the other worker bees?4.What enables the bees to fly by the sun even though the sun’s position is not fixed?
A.the sun B.the stars C.magnetic fields D.wind direction问题2： A.The possibility of bad weather B.The constant motion of the sun. C.Its patterns of migration. D.Its need to constantly change homes.问题3： A.The time of the day. B.What the weather is like. C.How far away the food is. D.Which flowers the scout has found.问题4： A.They are equipped with biolIf you don’t want to talk to him, I’ll speak to him（ ） .
A.on your behalf B.on your account C.for your part D.in your interest
The mayor is a woman with great（ ） therefore deserves our political and financial support.
A.intention B.instinct C.integrity D.intensity
Of all the wild dogs, none is more closely related to the （ ） dog than to the wolf.
A.domesticated B.barking C.lazy D.running
1.根据牛顿的发现, 白光是所有可见光叠加而成的。这就是加色概念的典型例子。例如去掉蓝色色调, 白光就会变为黄色, 还有其他例子等等。然而当把颜料的所有颜色混合, 我们会得到黑色, 这就是典型的减色理论, 黑色代表所有颜色都存在。加色是透射光的领域的概念, 减色是色素、染料和化学品的领域的概念。2.但是我们对创新的追求究竟是为了实现什么呢?创新就是一种重要的新产品或者新程序, 或者是一项制度, 能够在实际生活中大范围的应用, 对经济和社会有着革命性的意义, 就是以更低成本实现更高的工作效益。遗憾的是我们现在几乎把一切事情都用创新来形容, 因为不是所有创新都能给社会财富的増长和生活的改善提供一个长久的平台。3.睡眠问题研究者发现, 总的来说, 大多数人都是随着年龄的增加, 睡眠问题却越来越少, 上了年纪的人反而对失眠有更好的承受力。睡眠模式的大多改变都发生在20岁到60岁之间。那些经历着睡眠问题的人, 应该去看医生才好。因为他们经历的问题也许是某种生病的迹象, 也许是一些药物的副作用。
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