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.

下列指标中，适于评价寿命期不同的互斥方案的是( )。

A．现值法

B．差额内部收益率法

C．最小公倍数法

D．最小费用法

E．年值法