Bats __________ sound waves and make sense of their environment from the echoes they receive. (send)
举一反三
- Bats find insects in the dark of night with the help of ______. A: echoes B: eyesight C: sound waves D: none of the above
- 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
- When we make an enquiry, we will surely receive a response from the customer.
- I can't_________ this passage, that is to say, this passage _________ to me. A: make sense of; makes sense B: make sense of; makes no sense C: make sense; makes sense D: make sense; makes no sense