These songs can last from six to thirty-five minutes..."可知答案。 33.No, they can't.“Bats make sounds. They are too high for us to hear."可知,人类听不到蝙蝠的声音。 34. It will return to the hive and do a dance. 根一 中的"If a honeybee finds food, it will retum to the...
Besides, he knows that bats go by using46 to “see". Dr. Waters wondered if people could do something 47Bats make sounds as they 48. These sounds trave in waves (波) in the air. Whenthe waves_49_ an object such as a tree or a house,they bounce back (反射). The wavestravel ...
人教版七年级下册英语 Unit 1 重点单词短语句子听写版 PEP
Neil Well, the songs advertise the relationship between the male and the female. And they also help to make clear whichterritory– or bit of land – belongs to a pair or group of gibbons. Rob Gibbons also use different sounds toalert...
Bats, raccoons, mice and ratsare nocturnal, so you'll most likely hear these animals at night. Sounds like a tapping sound or a machine tapping on ion don't know if you can hear it in the audio. Do rats make noise when they move?
Scientists think that many animals sing to one another.First, we need to know the difference between a song and other sounds. Scientists say a song has tones(音调). Tones can make a melody, which is like a piece of music. So a dog's bark and a frog's croak are not songs.In a ...
It was only recently discovered, for example, that some species of frog make sounds in the ultrasound (超声) — the same part of the sound spectrum (谱) used by bats, a part of the spectrum that we cannot hear without special gear. Nor is it just animals that communicate. Plants and ...
Crying Sounds from Stressed Plants Here is what a dehydrated tomato plant sounds like: This real sound was recorded from stressed tomato plants using ultrasonic microphones. The sound frequency is too high for humans to hear but some insects and bats should be able to hear it. In this audio ...
1. Blind people, without even being aware of the fact, are actually using echoes of their own footsteps and of other soundsto sense of the presence of obstacles. 2. The American zoologist Donald Griffin, who was largely responsi...
Sounds travel through solids "best" in that the sound wave moves very quickly. However, it also takes more energy to vibrate a solid object,... Learn more about this topic: Sound Energy: Lesson for Kids from Chapter 6/ Lesson 42