污水中的氮只是来自工业废水。
参考答案：错
先天性三色盲是：
A．性连锁隐性遗传
B．性连锁显性遗传
C．常染色体隐性遗传
D．常染色体显性遗传
E．都不对
The harder you work, the______likely you are to qualify as a doctor by the time you graduate.
A．much
B．more
C．fewer
D．less
