某实验小组对不同条件下的硝酸钾的溶解情况进行了以下实验：在甲乙丙三个烧杯中放入20g硝酸钾晶体，再分别加入50g冷水、热水与酒精，充分搅拌后（保持各自的温度不变），结果如图所示．

（1）甲烧杯中溶液是____ （填“饱和”或“不饱和”）溶液．

（2）由以上实验可得出结论：影响物质溶解度的因素有____ 、____ ．

（3）将乙烧杯中的溶液降温到t₁℃时，溶液恰好达到饱和状态．则t₁℃时，硝酸钾的溶解度是____ g/100g水．再往乙烧杯中加入10g水，改变温度至t₂℃时，溶液又恰好达到饱和状态，则t₁____ t₂（填“＞”、“＜”或“=”）．

实验室用如图装置制取氧气时，有关实验操作顺序正确的是（　　）

根据对话内容，从方框内所给的七个选项中选出五个，使对话完整。

a. I'll watch it.

b. What are you doing?

c. I'd rather watch some other programs.

d. Don't worry.

e. How was your science exam?

f. Which teams are playing?

g. Is there a football match onTV tonight?

Richard: Hi, Simon.  ____

Simon: Not too good.

Richard: Well, the term exam is always more difficult.  ____You'll certainly do better next time.

Simon: But unluckily, I've never done well in the science exam.

Richard: Come on, Simon! Let's talk about the football match tonight. It is much more interesting.

Simon:   ____

Richard: Yes. It's between the Chineseteam and the Japanese team.

Simon: Er…  ____

Richard: Why? Everybody knows you area football fan.

Simon: The Chinese team has always played badly in the important matches, just as I have done in the importan texams.

Richard: Well, I think the team is making good progress.  ____

下图为精细胞形成过程中几个时期的细胞模式图，下列有关叙述不正确的是（）