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试述完全连锁和不完全连锁遗传的特点及规律。

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一个以不育系为母本的回交一代呈现3:1的可育株与不育株的分离，这个不育系属于不育，并且和对核

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Questions 14-16 are based on the interview with British singer and song writer Beth Orton.You now have /5 seconds to read Questions 14-16.
14. When did Beth Orton begin singing？
[ A] After she met William.
[B] Before she went to acting classes.
[C] After she dropped out of school.
[D] Before she joined a traveling group.