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操作系统有两个重要的作用，一个是管理系统中的各种软硬件资源；另一个是向用户提供良好的 【2】

答案

参考答案：界面或接口

解析： 操作系统的两个作用是： 1)管理系统中的各种资源； 2)为用户提供良好的界面。

阅读理解
阅读理解。
    Mr and Mrs Brown have two children, Mike and Liz. The whole family are all busy, so they often leave
notes for each other. Read these four notes of today and answer the following questions.
①3:30 p.m.
To Mike,
     Mr Tyler rang. No football practice today. I'm going to Donna's house to play and be back at
5:00 p.m. 
                                                                                                                                     Liz

② 4:00 p.m
To Liz, 
     It's your turn to walk the dog. I have to do my homework after school. Remember to play with
Teddy when you get home.
                                                                                                                                      Mike

③6:45p.m.
     Has anyone seen my tennis shoes? I'm in my bedroom doing my homework. 
                                                                                                          Mike

④9:00 p.m. 
    I saw your shoes this morning. They smelt terrible so I put them outside the back door. Good
night, dears! 
                                                                                                                                    Mum
1. When will Liz be back home?
[ ]
A. At 3:30 p.m.
B. At 4:00 p.m.
C. At 5:00 p.m.
D. At 9:00 p.m.
2. Who should walk the dog today?
[ ]

A. Mike.
B. Mrs Brown
C. Liz
D. Mr Brown

3. What's Mike probably doing at 6:50 p.m?
[ ]
A. Practicing football.
B. Going to Donna's house.
C. Playing tennis.
D. Doing his homework.
4. Where can Mike find his tennis shoes?
[ ]
A. In his bedroom.
B. Outside the back door.
C. In the living room.
D. At Donna's house.
5. According to the notes, Teddy is            .
[ ]
A. Mike's mother
B. Mike's brother
C. Mike's football coach
D. the dog in the family
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问答题 简答题

启动沼气池时，加入一定的接种物可加快启动速度和提高产气量吗？
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