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【单选题】
在百花齐放的季节到花丛中散步，如果我们闭上眼睛可以听到蜜蜂在飞来飞去，但却无法听到蝴蝶的动静，其中的原因在于（ ）。A.
蜜蜂翅膀振动的频率要高于蝴蝶的频率，而人的听觉有一定的限度，只能够接收到蜜蜂的频率，却无法感觉到蝴蝶的频率
B.
蜜蜂口器发出的声音要高于蝴蝶口器所发出的声音，而且蜜蜂是群居性昆虫，彼此之间交流频繁，所以人能够经常性地听到蜜蜂的声音
C.
蜜蜂的腹部具有称作“蜂鸣器”的器官，可以以人耳能够察觉的高频发出声波，而蝴蝶不具备有发声器官，所以人能够听到蜜蜂的声音，而听不到蝴蝶的声音
D.
蜜蜂在运动时，其腹部坚硬的角质层与其腿部摩擦，借以向同伴传递讯息，所以能发出声音，而蝴蝶的腹部则非常柔软，且没有发声器官，所以飞行时没有声音
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举一反三
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【单选题】The English language has always changed, but the rate of change has been uneven.
A.
portion
B.
speed
C.
standard
D.
measure
【单选题】George Washington______.
A.
always will and always has been an American hero
B.
always has and always will an American hero
C.
always has and always will be an American hero
D.
always has been and always will be an American hero
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A.
Right
B.
Wrong
C.
Not mentioned
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