【题目】Have you ever heard of a bug(虫子)called the cicada(蝉)?Well,a special kind of these bugs live underground in the US for most of their lives.They have an interesting bio-clock.【1】
Every 17 years,billions of the noisy Brood V cicadas will swarm(涌现)to northeastern parts of the US, including New York,Ohio and Pennsylvania.【2】But there are usually a lot less of them compared to the Brood V cicadas.
【3】According to Discovery News,these bugs started their lives in 1999.And as their 17-year life cycle comes to an end,they go above ground when their underground homes get warmer—64 degrees Fahrenheit (about 18℃) to be exact.Then the females will lay hundreds of eggs in trees.【4】The baby cicadas will go underground,and the 17-year cycle will start over again.
While they can be kind of annoying,these bugs don't harm humans.【5】That sound is the male cicadas attracting the female cicadas.Besides,a large amount of laid eggs can sometimes harm small trees and bushes because there are so many of the 17-year cicadas.However,after this summer,these bugs will mostly mind their own business until 2033.
A.They feed on leaves and roots.
B.It tells them when to go above ground.
C.What makes Brood V cicadas so special?
D.But they do make a lot of noise during their time above ground.
E.After about four to six weeks,the mother and father cicadas will die.
F.For a different brood of cicadas,mating season is just around the corner.
G.There are other kinds of cicadas that come around once a year or every 13 years.