右图中双螺旋结构c表示的是
A.DNA
B.蛋白质
C.染色体
D.基因
答案:A
图中的a是染色体,染色体由蛋白质b和DNAc组成,DNA是生物的主要遗传物质,具有双螺旋结构。
阅读下面对话,从方框内7个选项中选择5个恰当的句子完成此对话,并将其番号填入题前括号内。
A.Can you help me?
B.What color would you like?
C.Can I help you?
D.Do you have a smaller one.E. How much are they?
F. What about this one?
G. What’s the price?
A: 1
B: Yes, please. I want a skirt for my daughter.
A: 2
B: Green or blue.
A: Look at the skirts over there. We have different colors.
Which would you like?
B: I think the green one is nice. 3
A: It’s 150 yuan.
B: Oh, it’s too expensive(贵)
A: 4 It’s only 60 yuan.
B: It’s cheap, but it is big. 5 .
A: Yes. Here you are.
输尿管异位开口()
A.能自行排尿,但又经常打湿裤子
B.右侧阴囊包块透光试验阳性
C.两上腹包块,伴肾功能不全
D.阵发性高血压
E.5岁男孩阴囊发育不良,无内容物