全国100所名校最新高考冲刺卷英语2023届Y1

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According to a new study at Tel Aviv University,fireflies produce strong ultrasonic sounds(超声波)sound waves that the human ear,and more importantly the fireflies themselves, cannot detect.The researchers assumed that these sounds are meant for the ears of bats,keeping them away from the poison- ous fireflies,and thereby serving as a kind of "musical armor.The study was led by Prof Yossi Yovel,Head of the Sagol School of Neu roscience. Fireflies are known for their unique light,used as a mating signal.Since their bodies contain poison,the light flashes proba- bly also serve as a signal-a warning to potential predators )This signal is also the firefly's weakness,simply because it