TPO58听力Lecture1原文+MP3+题目+答案下载

TPO58听力Lecture1原文+MP3+题目+答案下载

TPO58听力Lecture1原文:

Listen to part of a lecture in a biology class.

So those are some of the common theories on bird migration. Now let's talk about homing. Homing is more than just the return flight home from migratory trips. Homing can take place at any time and from any location. It's the ability that some birds have of finding their way back to an exact location, regardless of their starting point or how far away they are, or the time of year and so on.

You've all heard of homing pigeons,but there are lots of bird species that have highly refined homing skills. So maybe there's some evolutionary advantage. Why would birds be so good at this? TOM?

Well, baby birds stay in the nest while the parents go out and hunt for food.If the parents have to fly all over the place to find the food, they'd need to be able to find the nest again.and Once you've found food, you want to get home quickly, wouldn't you? to feed your young. so you'd want the most direct path home, you wouldn't want to retrace whatever winding meandering path you'd taken while you were searching for food. Being able to fly home directly is very efficient. The offspring get food faster and their parents are home sooner to look out for them.But it isn't just the offspring that benefit, the adult birds get back to a safe place sooner as well.

Right! now, what about finding your way home after going south for the winter? well, It'd be nice if you could go back to a place you knew was okay, one that's got water or food, not too many predators, someplace where you might even still have a nest.

Good. Now, so far we've been talking about times when birds intentionally or at least instinctively leave home.But are there other reasons why a bird might find itself away from its nest? Birds are vulnerable to really strong winds. Storms could blow them pretty far off course.

.........剩下原文以省略！

TPO58听力Lecture1题目：

1. What does the professor mainly discuss in the lecture?

Click on 2 answers

A. Some ways birds benefit by having homing abilities

B. Several ways that birds improve their homing abilities

C. Some navigational tools that birds use in migration and homing

D. Several research studies that measure migration and homing abilities in birds

2. According to the professor, what are three ways in which homing behavior is different from migration behavior in birds?

Click on 3 answers

A. Homing is not a seasonal activity

B. Homing does not always involve long distances

C. Homing behavior is learned rather than instinctive.

D. Homing abilities allow birds to deal with unexpected situations

E. Homing requires the use of different navigational tools than does migration

3. Accord ing to the professor, birds often take a different route when they leave the nest to hunt for food than they do when they return to the nest. What is one reason for this behavior?

A. Birds use the return flight to teach their young homing skills

B. Birds want to complete the return trip as quickly as possible

C. By taking different routes, birds have access to more food sources

D. By taking different routes, birds avoid predators that may try to fol low them.

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