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问题 选择题

下列图形中，不一定是轴对称图形的是（　　）

A．线段

B．直角

C．直角三角形

D．等腰三角形

答案

根据轴对称图形的定义可得A、B、D都是轴对称图形，只有C不一定是，

故选：C．

阅读理解
阅读理解。
                                                              Single-use Things
     Hotel customers in Changsha, capital of  Hunan Province, will no longer get free things like toothbrushes. The local government has decided that hotels should put a price on these single-use things. It will begin on
July 1. Youth.cn has reported.

                                                        New Ways to Protect Eyes
     Many students in China are doing the new eye exercises. Do they like the new changes? Here are two
opinions of students in Beijing.
     LiHua, 14, Beijing Sanfan Middle School:" I like the new background music better. It is more relaxing
than the old one."
     LuWenqi, 12, Beijing Xicheng Foreign Language School:" The new exercises are healthier. The part of
rubbing (摩擦) the ground with our feet is funny. We all laugh while doing it."

                                       Popular Ways to Say Goodbye to Middle School Life
    In addition to a big meal, there are also some new popular ways to say goodbye before graduation.
    ▲Travel with your classmates.
    ▲Set up a website to help your group keep in touch.
    ▲Record everyone's best wishes and their smiles with a DV and make a DVD copy for everybody.
    ▲Clean the class room for one last time.

1.When will Changsha hotels put a price sign on the single-use things?
[ ]
A.On May 1.
B. On June 1.
C.On July 1.
D.On August 1.
2.Which is the way to keep in touch with classmates in Piece 3?
[ ]
A.To go travelling.
B.To make a DVD.
C.To clean the classroom.
D.To set up a website.
3.How many ways are talked about in Piece 3?
[ ]
A.Three.
B.Four.
C.Five.
D.Six.
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单项选择题

数据库管理系统负责组织和管理数据，使数据独立于用户，并使数据能方便、快速、安全地为( )使用。

A．单个用户

B．二个用户

C．三个用户

D．多个用户
查看答案