单项选择题
硬骨鱼在动物演化史上第一次出现上下颌,有麦氏软骨和腭方软骨组成。( )
A.对
B.错
硬骨鱼在动物演化史上第一次出现上下颌,有麦氏软骨和腭方软骨组成。( )
A.对
B.错
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单项选择题
Besides a lack of visual effects, what is mentioned as another weakness of radio ads
Besides a lack of visual effects, what is mentioned as another weakness of radio ads
A.Radio advertising time is limited
B.The audience is limited
C.Radio ads are too expensive