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科目:czwl 来源: 题型:阅读理解


C
A gadget which makes water out of air could become the greatest househo1d invention since the microwave.
Using the same technology as a dehumidifier(除湿器),the Water Mill is able to create a ready supply of drinking water because it can always get it from an unlimited source—the air.
The company behind the machine says not only does it offer an alternative to bottled water in
developed countries, but it is a solution for the millions who face a daily water shortage.
The machine works by drawing in wet air through a filter(过滤器)and over a cooling instrument which changes it into water droplets.It can produce up to 1 2 liters a day.The Water Mill will also produce more water when storms pass over, as the amount of water which is contained in the air increases. In keeping with its eco-development, the machine uses the same amount of electricity as three lights.
Inventor Jonathan Ritchey said: “The demand for water is off the chart. So people are looking for freedom from water distribution systems that are shaky and unreliable.”
The machine, which is about 3 feet wide, is likely to cost £800 when it goes on sale here in the spring. Its maker, Canadian Firm Element Four, roughly calculates that a litre of water cost around 20p to produce.
Environmentalists state that half the world’s population will face water shortage because of climate change by 2080. One in five is said to lack access to safe drinking.
The Water Mill is not effective in areas where the amount of water contained in the air is below about 30 percent, but in Britain that won’t be much of a problem.
63.What does the underlined word “it” refer do?
A.Drinking water.       B.Invention. C.Microwave.      D.Water Mill.
64.What do we learn about the machine?
A.It works in the same way as microwaves.
B.It is very expensive for families to afford.
C.It absorbs steam and turns it into water.
D.It helps to make the water clean to drink.
65.What does the passage lead us to believe?
A.The cost of water will go up.  B.Bottled water will disappear sooner.
C.The machine is energy saving. D.The machine will be popular worldwide.
66.What’s the best title for the passage?
A.A New Way to Solve Water Problem.    B.A Machine to Make Water out of Air.
C.A Dehumidifier to Produce Water.     D.An Absolutely New Invention

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科目:czwl 来源: 题型:阅读理解


C
A gadget which makes water out of air could become the greatest househo1d invention since the microwave.
Using the same technology as a dehumidifier(除湿器),the Water Mill is able to create a ready supply of drinking water because it can always get it from an unlimited source—the air.
The company behind the machine says not only does it offer an alternative to bottled water in
developed countries, but it is a solution for the millions who face a daily water shortage.
The machine works by drawing in wet air through a filter(过滤器)and over a cooling instrument which changes it into water droplets.It can produce up to 1 2 liters a day.The Water Mill will also produce more water when storms pass over, as the amount of water which is contained in the air increases. In keeping with its eco-development, the machine uses the same amount of electricity as three lights.
Inventor Jonathan Ritchey said: “The demand for water is off the chart. So people are looking for freedom from water distribution systems that are shaky and unreliable.”
The machine, which is about 3 feet wide, is likely to cost £800 when it goes on sale here in the spring. Its maker, Canadian Firm Element Four, roughly calculates that a litre of water cost around 20p to produce.
Environmentalists state that half the world’s population will face water shortage because of climate change by 2080. One in five is said to lack access to safe drinking.
The Water Mill is not effective in areas where the amount of water contained in the air is below about 30 percent, but in Britain that won’t be much of a problem.
63.What does the underlined word “it” refer do?
A.Drinking water.       B.Invention. C.Microwave.      D.Water Mill.
64.What do we learn about the machine?
A.It works in the same way as microwaves.
B.It is very expensive for families to afford.
C.It absorbs steam and turns it into water.
D.It helps to make the water clean to drink.
65.What does the passage lead us to believe?
A.The cost of water will go up.  B.Bottled water will disappear sooner.
C.The machine is energy saving. D.The machine will be popular worldwide.
66.What’s the best title for the passage?
A.A New Way to Solve Water Problem.    B.A Machine to Make Water out of Air.
C.A Dehumidifier to Produce Water.     D.An Absolutely New Invention

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科目:czwl 来源: 题型:

(2001•南京)如图中,重为5N的木块A,在水中处于静止状态,此时绳子的拉力为3N,若绳子突然断了,木块A在没有露出水面之前,所受合力的大小和方向是(  )

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科目:czwl 来源: 题型:

爱因斯坦、杨振宁、牛顿和伽利略都是我们熟悉的科学家或物理学家,若按他们生活的年代将他们排序(先出生的在前),则下列排序正确的是(  )

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科目:czwl 来源: 题型:

11、以下关于核能发电的说法中正确的是(  )

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科目:czwl 来源: 题型:

站在岸上的人看到平静的水面下有一静止的物体,如图,如他想用一束强光照亮物体,则应瞄准(  )

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科目:czwl 来源: 题型:

(2009•太原)如图所示,开关闭合后,当滑动变阻器滑片P向右滑动过程中(  )

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科目:czwl 来源: 题型:

精英家教网一小孩从公园中的滑梯上加速滑下如图,对于其机械能的变化情况,下列说法中正确的是(  )

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科目:czwl 来源: 题型:

如果“声音在空气中的传播的速度变为1米/秒,则我们周围的世界会有什么变化?“关于这一问题的讨论,一位学生提出了下列四个有关的场景,请你判断不正确的是(  )
A、教室内学生能更清楚地听到教师的讲课声B、乐队在会场内的演奏将变得很混乱C、汽车的喇叭不能再起到原来的作用D、我们听到万米高空传来的客机声时,却不能看到该飞机

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科目:czwl 来源: 题型:

在凸透镜成像的实验中:
(1)实验前,在光具座上自左至右依次插上蜡烛、
凸透镜
凸透镜
和光屏,并调节它们的高度,使烛焰、凸透镜和光屏它们的中心在
同一水平高度
同一水平高度
,这样做的目的是
使烛焰的像成在光屏的正中央
使烛焰的像成在光屏的正中央

(2)小明同学用一个标有“f=20cm”的凸透镜做“探究凸透镜成像规律”的实验,获得下表数据,请按表格要求填好表中空白处.
物体到凸透镜的距离像到凸透镜的距离像的大小(放大或缩小)像的正倒
60cm30cm缩小倒立
50cm33cm 倒立
30cm60cm放大倒立
24cm120cm放大倒立
16cm与物体同侧约80cm放大正立
(3)物体由五倍焦距处向凸透镜一倍焦距处靠近时(即物距减小),则像距
增大
增大
(填“增大”、“减小”或“不变”),像
变大
变大
(填“变大”、“变小”或“不变”).像和物的距离将(
D
D

A.变大        B.变小        C.先变大后变小       D.先变小后变大.

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科目:czwl 来源: 题型:

5、作用在同一个物体上的两个力F1和F2,它们在同一直线上.已知两个力的合力F=40N,方向水平向左,分力F1=30N,则另一分力F2的大小和方向可能是(  )

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科目:czwl 来源: 题型:

10、下列说法中正确的是(  )

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科目:czwl 来源: 题型:

8、一位同学用托盘天平称物体的质量,他把天平放在水平工作台上,然后对天平进行调节,由于疏忽,当游码还位于0.1克位置时就调节平衡螺母,使指针对准标尺中间的红线,然后把待测物体放在天平的左盘,砝码放在天平的右盘,当天平右盘中放入20g砝码2个、5g砝码1个时,天平的指针恰又指在标尺中间的红线上,则被测物体的实际质量应为(  )

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科目:czwl 来源: 题型:

(2010•北京一模)图甲是水流形成图,我们对电流的成因(图乙)的认识是通过分析图甲中水流的成因来了解的,这种方法在物理学中称为:(  )

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科目:czwl 来源: 题型:

用照相机拍照时,如果要使人的像再大些,则应(  )

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科目:czwl 来源: 题型:

23、下列说法不正确的是(  )

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科目:czwl 来源: 题型:

如图所示,粗细不均匀的木料在O点被支起,处于平衡状态,则下列说法错误的是(  )

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科目:czwl 来源: 题型:

5、以下现象解释正确的是(  )

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科目:czwl 来源: 题型:

4、下列事例中,做功改变物体内能的是(  )

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科目:czwl 来源: 题型:

如右图所示是我国湖北随州曾候乙墓出土的战国时期的编钟,距今2400余年,是世界上现存最大的编钟.这套编钟共65件.制作这么多钟是为了产生更丰富的(  )

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