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'The world's oceans are slowly getting more acidic.”say scientists.The researchers from California report that the change is taking place in response to higher levels of carbon dioxide in the atmosphere. The lowering of the waters’pH value is not great at the moment but could cause a serious threat to current ocean life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature. Increasing use of oil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the oceans have already become slightly more acidic over the last century. These researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change.'This level of acidity will get much more extreme in the future if we continue releasing COZ into the atmosphere,' said Dr Caldeira. 'And we predict the amount of future acidity will exceed(超过)anything we have seen over the last several hundred million years, let alone perhaps after rare disastrous events such as asteroid(小1j-%+.'_) impacts.” However, it is not absolutely clear what that means for ocean life.Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean life forms may be more sensitive to pH changes.Coral reefs and other organisms whose shells contain calcium carbonate(小行星) may be particularly affected if the water's acidity levels keep going up, the team predict. They could find it much more difficult to build these structures in water with a lower pH. In recent years some people have suggested storing carbon dioxide from power stations in the deep ocean as a way of dealing with global warming.But Dr Caldeira said that such a strategy should now be re-considered. 'Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing一because in releasing CO2 into the atmosphere we warm the planet, and when CO2, is absorbed by the ocean, it reduces the amount of greenhouse warming.” 小题1:The ocean is becoming more acidic due to_. A,the lower water pH value           B.the warming atmosphere C .the higher level of COZ in the air     D.the increasing use of oil fuels 小题2:According to Dr Caldeira,_. A.ocean absorption of carbon dioxide is a good thing B.more oil fuels will be used in the near future C.scientists may predict climate changes with computer models D.the future situation of the amount of acidity is extremely serious 小题3:If the water's acidity level keeps rising,_. A.ocean life whose structures contain calcium carbonate may be affected B.the waters’pH value will become higher and higher C.organisms living near the surface are more sensitive to pH changes D.some disastrous events will occur more often than before 小题4:Most experts once believed storing carbon dioxide in the ocean would reduce_. A.the COZ absorbed by the ocean B.the amount of greenhouse warming C.the acidity of the ocean D.the gradul release Of CO2 小题5:The purpose of this passage is to_. A.show people the findings of a research team B.inform people of how acid the ocean is now C.introduce Dr Caldeira and his team's research D.warn people of the higher level of COZ
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【单选题】在20世纪一二十年代发表著作,对官僚制度进行系统分析和论证,并促成了公共行政学理论体系建立的德国学者是( )。
A.
马克斯·韦伯
B.
古德诺
C.
法约尔
D.
赫伯特·西蒙
【判断题】在一般情况下,两回转体的相贯线是封闭空间曲线, 但在特殊情况下 ,也可能是平面曲线或直线或不封闭。
A.
正确
B.
错误
【多选题】为了实现四个现代化的这一宏伟目标,毛泽东提出了应当采取“两步走”的发展战略,以使中国走在世界前列。该“两步走”发展战略的内容包括( )。
A.
第一步建成一个独立的比较完整的工业体系和国民经济体系
B.
第二步全面实现农业、工业、国防和科学技术现代化
C.
第一步全面实现农业、工业、国防和科学技术现代化
D.
第二步建成一个独立的比较完整的工业体系和国民经济体系
【单选题】如图,在图1中,A 1 、B 1 、C 1 分别是等边△ABC的边BC、CA、AB的中点,在图2中,A 2 ,B 2 ,C 2 分别是△A 1 B 1 C 1 的边B 1 C 1 、C 1 A 1 、A 1 B 1 的中点,…,按此规律,则第n个图形中菱形的个数共有(  )个.
A.
n 2
B.
2n
C.
3n
D.
3n+1
【多选题】四个走在全国前列的内容是
A.
在构建推动经济高质量发展的体制机制上走在全国前列
B.
在加快建设社会主义现代化新征程上走在前列
C.
在建设现代化经济体系上走在全国前列
D.
在形成全面开放新格局上走在全国前列
E.
在营造共建共治共享社会治理格局上走在全国前列
【多选题】多选:为了实现四个现代化的这一宏伟目标,毛泽东提出了应当采取“两步走”的发展战略,以使中国走在世界前列。该“两步走”发展战略的内容包括( )。
A.
第一步建成一个独立的比较完整的工业体系和国民经济体系
B.
第二步全面实现农业、工业、国防和科学技术现代化
C.
第一步全面实现农业、工业、国防和科学技术现代化
D.
第二步建成一个独立的比较完整的工业体系和国民经济体系
【简答题】如图4,在图(1)中,A1、B1、C1分别是△ABC的边BC、CA、AB的中点,在图(2)中,A2、B2、C2分别是△A1B1C1的边B1C1、C1 A1、 A1B1的中点,…,按此规律,则第n个图形中平行四边形的个数共有     个.
【单选题】在图中,图 1 和图 2 说明了什么?
A.
图 1 :聚合;图 2 :复合
B.
图 1 :属性;图 2 :聚合
C.
图 1 :聚合;图 2 :属性
D.
图 1 :属性;图 2 :复合
【简答题】在Solid Works草图环境中,1:1绘制以下平面图形。 图2-1 图2-2 图2-3 图2-4 图2-5
【简答题】请你在图1图2中画出对应的入射光线。 图1                                           图2
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