Mary: Peter, what's your favourite subject?

Peter: My favourite subject is science. What's Lisa's favourite subject?

Mary: Her favourite subject is math.

Amy: I like math, too. But my favourite subject is Chinese. Whose favourite subject is English?

Mary: That's my favourite subject.

小华同学利用电压表和电流表测量电阻R₁的阻值（约9Ω左右），电源选用两节干电池．实验过程如图所示．

x－33=22

x=____

下列各项措施中，用来减小有害摩擦的是(　　)

根据短文内容, 完成下列各题。

    Jack's friend Sally isn't fine these days.

    One day she asks Jack for help. And she tells (告诉) Jack about her eating habits. For breakfast, she always eats some bread. For lunch, she always has some chicken. She likes eating ice-cream and a hamburger in the evening.

 “They're not healthy for you, Sally,” Jack says.

 “I know, but I like them,” Sally says.

 “What about vegetables? Do you like eating carrots?” Jack asks.

 “No, I don't,” Sally says.

 “Sally, don't eat ice-cream. You must eat some vegetables and fruit. They are good for you.” Jack says.

 “I think you're right,” Sally says.

    In the next days, Sally always eats vegetables and fruit. And she is well now.