问题
单项选择题
线虫身体的特点是（）最发达。
A、生殖系统
B、呼吸系统
C、消化系统
D、以上都不是
答案
参考答案：A
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线虫身体的特点是（）最发达。
A、生殖系统
B、呼吸系统
C、消化系统
D、以上都不是
参考答案：A
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| Hi, I'm Zhu Hua. I'm a junior high school student in Beijing. There are twenty-six boys and twenty-two girls in my class. Half of the students come to school by bike. Five boys and four girls come to school on foot. About a quarter of us come to school by bus. The rest come to school by subway. We're all from China. We're good friends.
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