选出合适的应答语{"A":"Yes, he is.","B":"Yes, he does."}

题干

选出合适的应答语（）

A：Yes, he is.

B：Yes, he does.

上一题下一题 0.0难度选择题更新时间:2017-03-02 09:23:46

B

Situations	Differences
Situations	Britons (英国人)	Americans
When being knocked into	They will say “sorry” before the other does.	They will ____ the person and expect him to say “sorry”.
When going out for dinner	They will ____ when going out for dinner.	They may wear a normal shirt to go to a good____.
When taking a taxi	They will give an address to the taxi driver and then ____.	They will ____ the taxi driver all the time.

控制变量是科学探究的重要方法之一．小华同学实验中发现：把质量相等的不同物质放入同样一杯水中，有的溶解快，有的溶解多，有的溶解又快又多．是哪些因素影响着物质溶解的快慢与多少呢？

请你参考下表硝酸钾的溶解度随温度的变化关系，以硝酸钾为例，选择一种可能影响硝酸钾溶解快慢的因素设计实验进行探究：

温度（℃）	20	30	40	50	60	70	80
溶解度（g）	31.6	45.8	63.9	85.5	110	138	168

①影响因素：____ 实验中，控制不变的因素是____ ．

②实验方案：____ ．