题目内容

[ A] an alligator
[ B] a pet
[ C] a book
[ D] a cake

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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.

按植物雄性不育类型划分，配子体不育又属于核不育。

已知连锁遗传的基因t、r的交换值为20%，

[ A] Bobby ' s birthday
[ B ] Christmas Eve
[ C] New Year' s Day
[ D] Mother' s Day