根据句意或首字母填词。

1. Do you have a healthy l_______? Do you have good e_______ habits?

2. Eating a lot of vegetables is good for our  _______ .

3. —Can I help you?

    —Of _______, I'd like a hamburger, please.

4. Don't worry. M  _______he can help you.

5.  This picture is d  _______ from that one, can you tell me the d_______ between

     the two pictures?

6.  My grandfather is still healthy, a_______  he is over 80 years old.

7.  I got good g_______with the help of my English teacher last term.

8.  Some students always s _______ the Internet to get more information.

9. My mother has a healthy lifestyle. She eats l_______ junk food but more vegetables.

在图（a）所示的电路中，电源电压为6伏且不变，滑动变阻器R₂标有“50Ω 3A”字样。闭合电键S后，电流表A₁的示数为0.6安。求：

（1）电阻R₁的阻值。

（2）将变阻器R₂的滑片P移至某点时，某电流表的示数如图（b）所示，10秒内变阻器R₂所消耗的电能W2。

（3）变阻器R₂所消耗的最大功率P₂。