基因型是Dd的豌豆自交三代,所得后代种子中杂合子占[ ]
A.75%
B.50%
C.25%
D.12.5%
答案:D
根据上下文意思和首字母提示,将下列短文填写完整。
A: What d is it today ?
B: It's the second of January.
A: Oh, yesterday (昨天) w New Year's Day.
B: What d you do yesterday ?
A: I h a nice day. I watched a film with my good f in the morning.
B: Did you l the film ?
A: Yes,we did. It was a funny cartoon.
B: What e did you do ?
A: We w camping in the afternoon. We did many interesting things t . We were very tired but
really h .
B: You had a wonderful day. I'd like to go camping, too.
秘书在调查研究的基础上撰写调查报告的工作属于()。
A、信息整理
B、信息提炼
C、信息开发
D、信息反馈