密封的烧瓶中装有某种气体,如图所示,图中的黑点表示气体分子,用抽气筒抽出该烧瓶中

题型:选择题

问题:

密封的烧瓶中装有某种气体,如图所示,图中的黑点表示气体分子,用抽气筒抽出该烧瓶中部分气体后仍密封,描述烧瓶内剩余气体分子的四个示意图如图所示,其中正确的是(  )

A.

B.

C.

D.

考点:物质的三态及其基本特征
题型:选择题

阅读理解

     In most parts of the world, many students help their schools make less pollution. They join "environment clubs".

In an environment club,  people work together to make our environment clean.

     Here are some things students often do.

     No-rubbish lunches.  How much do you throw away after lunch? Environment clubs ask students to bring their

lunches in boxes that can be used again.  Every week they will choose the classes that make the Ieast rubbish and

report them to the whole school!

     No-car day.  On a no-car day,  nobody comes to school in a car,  not the students and not the te'achers! Cars give

pollution to our air, so remember:

     Walk, jump, bike or run.

     Use your legsl It's lots of fun!

     Turn off the water! Do you know.that some toilets can waste twenty to forty tons of water a half hour? In a year,

that will fill a small river! In environment clubs, students mend those broken toilets.

     We lovc our enyironment.  Let's work together to make it clean.

1. Environment clubs ask students __________.

A. to run to school every day

B. to take exercise every day

C. not to forget to take cars

D. not tothrow away lunch boxes

2. From the passage we know the students usually have lunch __________.

A. at school

B. in shops

C. in clubs

D. at home

3. On a no-car day, __________ will take a car to school.

A. both students and teachers

B. only students

C. neither students nor teachers

D. only teachers

4. After students mend toilets, they save __________.

A. a small river

B. a club

C. a lot of water

D. a toilet

5. The writer wrote the passage to ask students to __________.

A. clean schools

B. make less pollution

C. join clubs

D. help teachers

题型:选择题
下面正确的说法是(  )
A.体积单位比面积单位大
B.若
a
5
是假分数,那么a一定大于5
C.只有两个因数的自然数一定是质数
D.三角形是对称图形
题型:选择题

SWOT分析中属于组织内部可控因素的是()

A、优势、劣势

B、优势、机会

C、劣势、威胁

D、机会、威胁

题型:选择题

关于我国基本经济制度理解正确的一项是()

A.只有公有制经济是我国经济社会发展的基础

B.要毫不动摇的鼓励、引导非公有制经济发展

C.公有制经济中的国有企业属于集体所有

D.非公有制经济也体现了我国的社会主义性质

题型:选择题

对口头语言来说,配合使用态势语言可起到()作用,还可以辅助口头语言以使口语表达()更加明确。

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