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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】1931年至1935年,中国共产党内发生的对中国革命造成极其严重危害的错误是( )。
A.
“左”倾盲动主义
B.
“左”倾教条主义
C.
“左”倾冒险主义
D.
“左”倾经验主义
【简答题】预告信号机与其主体信号机的安装距离不得小于800m,当预告信号机的显示距离不足400m时,其安装距离不得小于()。
【判断题】当预告信号机的显示距离不足400m时,距主体信号机间的距离不得小于800m。
A.
正确
B.
错误
【单选题】导游同旅游团领队核对和商定日程表一般在( )进行。
A.
饭店大堂
B.
领队房间
C.
全陪房间
D.
旅游车里
【单选题】若是做个人营销,以下哪个名字更合适?
A.
氤氲
B.
ㄘㄤ
C.
张振业-中信银行理财顾问
D.
小宝贝
【单选题】当预告信号机的显示距离不足400m时,预告信号机与其主体信号机的安装距离应大于或等于()
A.
200m
B.
400m
C.
800m
D.
1000m
【单选题】当预告信号机的显示距离不足400m时,其安装距离不得小于( )m。
A.
800
B.
1000
C.
1200
【单选题】当预告信号机的显示距离不足400m时,预告信号机和其主体信号机的安装距离应≥()
A.
200m
B.
400m
C.
800m
D.
1000m
【判断题】中国最早的哲学著作是孔子的《论语》。
A.
正确
B.
错误
【简答题】1931年至1935年,中国内发生的对中国革命造成极其严重危害的错误是:
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