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  3. Researchers have found that migrating animals use a variety of inner compasses to help them navigate. Some direct themselves by

Researchers have found that migrating animals use a variety of inner compasses to help them navigate. Some direct themselves by

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问题     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 to 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 food, 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 bees 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.
What makes it necessary for a bird to rely on a magnetic compass when navigating?
选项 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.
答案A
解析 细节推理题。根据题干关键词makes it necessary，bird定位到原文首段尾句。原句中的cloudscover the sun与选项A对应。故答案为A。
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