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
A: are able
B: guide them
C: too high
D: to hear
举一反三
- Only by speaking with the microphone ______________. A: was he able to make herself hear B: he was able tomake herself hear C: he was able tomake herself heard D: was he able tomake herself heard
- Only by shouting at the top of his voice______. A. he was able to make himself hear B. he was able to make himself heard C. was he able to make himself hear D. was he able to make himself heard A: B: C: D:
- If someone stands too close to us, we are more likely to back away than to tell them they are too close.
- The three climbers can employ a guide to ______ them on their way up the mountain. A: guide B: conduct C: lead D: bring
- The drug with a high efficacy must be of high potency too