Bats find insects in the dark of night with the help of ______.
A: echoes
B: eyesight
C: sound waves
D: none of the above
A: echoes
B: eyesight
C: sound waves
D: none of the above
举一反三
- Bats __________ sound waves and make sense of their environment from the echoes they receive. (send)
- The attempt to help blind people to see with sound ________. A: was similar to the sound location system of the bats B: led to a product that sent out sound waves of about 20,000 cycles per second C: was experimented on a submarine D: turned out to be a failure
- Bats (are able) to (guide them) by producing sound waves (too high) for us (to hear). A: are able B: guide them C: too high D: to hear
- Development in the dark is termed . A: morphogenesis B: skotomorphogenesis C: photomorphogenesis D: None of the above
- If two main constituents of an idiom share the same initial sound, it is called ______. A: repetition B: alliteration C: rhyme D: none of the above