下列有关DNA的叙述,错误的是[ ]
A.DNA上携带有遗传信息
B.DNA是染色体的组成成分
C.一个DNA分子中含有一个基因
D.DNA为双螺旋结构
答案:C
根据句意及首字母提示补全单词,完成句子。
1. I had an o_______ to study in Beijing in2000.
2. Sorry to keep you w________.
3. The girl can do the job as w________as the boy.
4. The accident stopped me from g________ there on time.
5. He had a birthday party the o___ ____day.
如果一个项目获利10万美元的概率是60%损失10万美元的概率是40%那么项目预期货币价值是()
A.$100000利润
B.$60000亏损
C.$20000利润
D.$40000亏损