用一支30mL的试管给液体加热，最多只能取（   ）

图1、图2表示T₂噬菌体侵染大肠杆菌的相关实验，据图分析，下列叙述正确的是(      )

①甲处的噬菌体一定含有放射性

②乙处的噬菌休一定不含放射性

③图2增设一组³⁵S标记的噬菌体作对照，可证明遗传物质是DNA，而不能证明蛋白质是不是遗传物质

④若培养到第2代，甲处DNA分子两条链都有放射性的噬菌体比例数为100%

补全对话。
A: Good evening.____
B: Yes, please. I want a pair of sneakers (运动鞋).
A:____
B: No, I want some light (轻的) ones.
A: What about this pair? They're light and they are fit for (适合) playing sports.
B: This pair looks nice. ____
A: What color do you like?
B: Brown or blue.
A: Here are the brown ones.
B: OK.____
A: 75 dollars.
B: I'll take them and here is the money.
A:____See you next time.

A. Can I help you? B. How much are they? C. Do you like these ones? D. The red ones look nice. E. But I don't like the color. F. But I don't like brown sneakers. G. Here are your sneakers and thanks for coming.

亚洲和北美洲之间的分界线是

在小写字母后面写出相应的大写字母。

q____   d____   ɡ____   h____   y____

e____   t____   j____   l____   r____