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人类遗传病种类较多,发病率高,下列选项中,属于染色体异常遗传病的是()。

A. 猫叫综合征
B. 苯丙酮尿症
C. 镰刀型细胞贫血症
D. 多指症

Editors do think explicitly about timing and they are not motivated merely to be the first to print an exciting news story: they keep stories until the time is______

A. prompt
B. ripe
C. enough
D. punctual

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