A. nevertheless B. therefore C. thereafter D. however
A. catastrophe B. disturbance C. impact D. insertion
A. diamonds B. ornaments C. crystals D. equipment
A. reluctantly B. deliberately C. voluntarily D. secretly
A. 空心的蛋白质管 B. 运动器官 C. 多糖质 D. 可传递遗传物质的器官 E. 基本结构
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