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【单选题】
下列有德尔一对相对性状的豌豆杂交实验的叙述,错误的是A.
豌豆在自然状态下一般是纯合子,可使杂交实验结果更可靠
B.
进行人工杂交时,必须在豌豆花未成熟前除尽母本的雄蕊
C.
在统计时,F2的数量越多,理论上其性状分离比越接近3∶1
D.
孟德尔提出杂合子测交后代性状分离比为1∶1的假说,并通过实际种植来演绎
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【单选题】Which of the following is INCORRECT?
A.
I'm sorry to hear that you resorted to cheating.
B.
She devoted every Saturday afternoon to tap dancing.
C.
I propose to going to London next Tuesday afternoon.
D.
I object to being blamed for something that I haven't done.
【简答题】Dear Aunty, I work at a supermarket, and another girl and I share tasks we must finish before leaving. But she takes half an hour to do something I can do in ten minutes. She always has a story to tel...
【简答题】阅读理解。 Dear Aunty, I work at a supermarket, and another girl and I share tasks we must finish before leaving. But she takes half an hour to do something I can do in ten minutes. She always has a story ...
【简答题】在三种RNA中，( )含量最多，( )含有的稀有碱基最多，( )半寿期最短。
【简答题】在生物细胞中主要有三种RNA,其中含量最多的是 ,种类最多的是 ,含有稀有碱基最多的是 。
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