题目

在探究“力对物体运动的影响”的实验中，在水平桌面上分别铺上分别粗糙程度不同的毛巾、棉布、玻璃，让小车自斜面顶端从静止开始滑下，小车从同一高度滑下后，在不同物体表面上运动的距离如图所示．（1）实验时小车每次都从斜面顶端滚下，是为了让小车在这些物体表面开始运动的相同．（2）由图示可知，小车在玻璃上运动的距离最，这说明小车受到的阻力越，速度减小得越慢．（3）根据这个实验推理：若水平物体表面绝对光滑（即小车不 PART FOUR WRITING Read the following passage．Fill in the numbered blanks by using the information for the passage．Write NO MORE THAN 3 WORDS for each answer． 　　A Low-Carbon Economy(LCE)refers to an economy which has a minimal emission of greenhouse gas(GHG), namely, carbon dioxide into the biosphere(生物圈)．Recently, most of the scientists and the public hold the opinion that the climate is changing because there is such an accumulation of CO2 in the atmosphere due to human activities．The over-concentration of these gases is producing global warming that affects long-term climate, with negative impacts on humanity in the foreseeable future．LCE, therefore, is proposed as a means to avoid catastrophic climate change． 　　All nations which are considered carbon intensive societies and societies which are heavily populated should become zero-carbon societies and economies．Several of these countries have promised to become 'low carbon' but not entirely zero carbon, and claim that emissions will be cut by 100％ by balancing emissions rather than ceasing all emissions． 　　Nuclear power and the strategies of carbon capture and storage(CCS)have been proposed as the primary means to achieve a LCE while continuing to exploit non-renewable resources．Scientists are afraid, however, whether the spent-nuclear-fuel can be stored, and whether it is secure．Also they are not certain about the costs and time needed to successfully implement CCS worldwide and whether the stored emissions will leak into the biosphere or not．Alternatively, many have proposed renewable energy should be the main basis of a LCE, but, they have their associated problems of high-cost and inefficiency; this is changing, however, since investment and production have been growing significantly in recent times．Furthermore, it has been proposed that to make the transition to an LCE economically attractive we would have to attach a cost(per unit output)to GHGs through means such as emissions trading and/or a carbon tax． 　　A LCE is aimed to integrate all aspects of itself from its manufacturing, agriculture, transportation to power-generation around technologies that produce energy and materials with little GHG emission and thus around populations, buildings, machines and devices which use those energies and materials efficiently and dispose of or recycle its wastes so as to have a minimal output of GHGs． Title：　　1　　 Ⅰ．　　2　　：an economy with a minimal output of GHG Ⅱ．　　3　　 of the present economy： ●global warming ●long-term climate change ●　　4　　 on humanity Ⅲ．　　5　　： ●to produce energy and materials with little GHG emission ●to use those energies and materials efficiently ●to have 　　6　　 of GHGs Ⅳ．　　7　　 to achieve a LCE： ●nuclear power ●the strategies of carbon capture and storage ●renewable energy ●　　8　　 ●a carbon tax Ⅴ．　　9　　： ●spent-nuclear-fuel storage/storage of spent-nuclear-fuel ●　　10　　 ●uncertainty about the costs and time needed?