一个柜子有16格,每一格放了一顶帽子,已知放了5顶红帽子,8顶蓝帽子,1顶白帽子

题型:填空题

问题:

一个柜子有16格,每一格放了一顶帽子,已知放了5顶红帽子,8顶蓝帽子,1顶白帽子和2顶黄帽子,任意打开一个格子,拿到红帽子的可能性是(    ),拿到蓝帽子的可能性是(    ),拿到白帽子的可能性是(    ),拿到黄帽子的可能性是(    )。  

考点:可能性,概率
题型:填空题

阅读理解。

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

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

     ·No-garbage(垃圾)  lunches. How much do you throw away after lunch? Environment clubs ask students to bring their lunches

in bags that can be used again. Every week they will choose the classes that make the least garbage and report them to the whole

school!

    ·No-car day. On the no-car day, nobody comes to school by car-not the students and not the teachers!  Cars give pollution to

the air, so remember:

    Walk, jump, bike or run.

    Use your legs!  It's lots of fun!

    ·Turn off the water! Did you know that some toilets can waste twenty to forty㎡of water an hour? In a year that would fill a

small river! In environment clubs, students mend those broken toilets.

    We love our environment. Let's work together to make it clean.

1. Environment clubs ask students____.

A. not to forget to take cars

B. not to throw away lunch bags

C. to go to school by car every day

D. to do exercise every day

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

A. in clubs    

B.at home    

C.at school    

D.in restaurants

3. On the no-car day,____will take a car to school. 

A. both students and teachers      

B.some students

C. neither students nor teachers    

D.some teachers

4. After students mend toilets, they save____.

A. much water    

B.a lot of money    

C.a long river    

D.a toilet

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

A. walk to school every day      

B.help teachers

C. bring their lunches in bags      

D.make less pollution

题型:填空题

将新鲜的苔藓植物叶片,放入其中加有少量红墨水的质量浓度为0.3g/mL的蔗糖溶液中,在显微镜下观察,你会看到苔藓细胞的状态如下图所示。此时,部位①和②的颜色分别是

[ ]

A.①无色、②绿色

B.①红色、②绿色

C.①红色、②无色

D.①红色、②红色

题型:填空题

()是对自然生态系统进行改造与利用的人工生态系统。

A.农业生态系统

B.工业系统

C.自然生态系统

D.林业生态系统

题型:填空题

进口设备的保修期及索赔期一般规定从()起6~12个月。

A.发货日

B.到货

C.订货

D.验收日

题型:填空题

下列化合物不能由单质直接化合得到的是

A.Na2O2

B.Fe3O4

C.NO

D.FeCl2

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