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29.What is Paragraph 2 mainly about?A.The ways to attract more international students.B.The popularity of Chinese courses.C The importance of painting.D.The content and the positive result of the courses.30.What does the underlined word"adequate"mean in the last paragraph?A.Enough.B.Terrible.C.Common.31.In which section of a newspaper may this text appear?D.Original.A.Entertainment.B.Health.C.Education.D.Science.0"In a close cooperation between several first-class chemists,physicists,and biologists,we have developed a very efficient water filter().It does not need any energy sourcebut sunlight,"said Forro."Thus our device can supply clean drinking water even at remoteplaces."The small,adaptable flat-bodied device was designed at Switzerland's EPFL researchinstitute,by a team led by Prof.Laszlo Forro.Water enters via a tube(管子)in the top,flows through a multilayer composite(复合的)material sandwiched between two sheets of glass,and exits through a tube in the bottom.Thecomposite material is made up of titanium dioxide nanowires(TDN,二氧化钛纳米线)interwoven with carbon nanotubes.When the filter is exposed to sunlight,the UV light(causes the composite to produce a group of molecules()known as reactive oxygenspecies.These molecules are highly effective at killing harmful bacteria and viruses.Itspotential challenge when working outdoors is rainy or cloudy days.The filter has already been successfully tested on water containing E.coli bacteria,withresults indicating that it should also have no problem ridding of other harmful bacteria.Infact,it is believed that the technology may also prove effective at ridding of micro-pollutantssuch as pesticides()and drug remains.It should be noted that when activated by UVlight,titanium dioxide nanowires on their own are capable of killing harmful viruses andbacteria.For that matter,even UV light alone can purify water,if the water is left sitting inthe sunlight in a transparent container.However,Prof.Forro told us that his team's filter is much more effective-this is due inpart to the carbon nanotubes'ability to absorb heat from the sunlight,making the purificationprocess faster.The present small-scale model can treat 2 liters (0.5 gal)of water per day,although that figure would rise considerably if the technology were to be scaled up.32.Why can the new filter work at remote areas?A.It is small and flat-shaped.C.It's designed by famous scientists.B.It can be powered by sunlight.33.Which aspects of filter does Paragraph 2 mainly focus on?D.It can be efficient in cleaning water.A.Working conditions.C.Strengths and weaknesses.B.Appearance and possible effects.What can we learn from Paragraph 3?D.Structure and working process.A.The filter can get rid of a lot of pesticides.B.The filter can kill all bacteria of the water.C.UV light is effective in purifying the water in a transparent container.D.TDN can kill viruses without being activated.35.What's the author's purpose of writing the passage?A.To state a new function of UV light.B.To introduce a solar-driven water filter.C.To inform the discovery of a new material.D.To stress the effectiveness of a water filter.