老
志愿者注意事项
As Dr. Miller mentioned, we're trying to recruit volunteers for the Hawk Mountain Sanctuary.
But before I get into the details of the volunteer program, I'd just like to tell you a little about what we do there.
One of our main jobs is to keep detailed records of the migration patterns of raptors.
For those of you who don't know, raptors are birds of prey, like hawks and eagles.
Between August and December, we see around twenty different species migrating from Canada and New England about 20,000 birds.
Part of what attracts them to Hawk Mountain is the location on the east ridge of the Appalachian Mountains.
What happens is that the sun warms the ridge in such a way that air currents are formed.
The birds just sort of glide along on the air so they use up very little energy.
As volunteers you'll be helping us keep accurate counts of the raptors.
Any drop in number could mean something's gone wrong in the environment because of pesticides or disease even hunting.
We just had a scare with the broad-winged hawks.
Their numbers have dropped drastically over the last ten years.
It was suggested that the birds may have changed their migratory route.
So for 11 days we had several hundred volunteers stationed every five miles to observe and count.
And sure enough, they discovered that instead of hugging the Appalachians as they'd always done, the broad-wings were cutting a wide path over the Delaware River.
Needless to say, we were greatly relieved.
以上就是关于“老托福听力93篇题目”的内容,希望通过上述内容的学习,让大家更好地备考考试,小编在这里预祝大家在考试中有更好的发挥,拿到高分成绩,如果大家在备考中有什么疑问,也可以咨询我们的在线老师哟~~~