皮皮学,免费搜题
登录
搜题
【简答题】
'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
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【简答题】某建筑公司承建的一座高层建筑,采用框架一剪力墙结构,抗震设计为8度设防。建设单位已与监理公司签订了施工阶段的监理合同,与承包商签订了施工合同。该工程需在现场用后张法制作一批预应力构件。为确保预应力构件质量,必须保证可靠地建立预应力值,监理公司派监理人员对预应力构件的制作实施旁站监理。本工程目前正在施工,但是工程施工时发生了如下事件:在地下室工程施工阶段,施工单位把地下室内防水工程给一专业分包单位承...
【单选题】下列情况确定销售额方法不正确的有( )
A.
还本销售时,一般不考虑还本支出;如销售方开具红字发票,则允许抵减销售额
B.
以旧换新时,应按新货物的同期销售价确定销售额,不得扣减就货物的收购价格
C.
以物易物时,双方均按购、销两笔业务处理
D.
折扣销售时,只有折扣额与销售额在同一张发票上注明,才允许抵减销售额
【简答题】某项目工程建设单位与甲监理公司签订了施工阶段的监理合同,该合同明确规定:监理单位应对工程质量、工程造价、工程进度进行控制。建设单位在室内精装修招标前,与乙审计事务所签订了审查工程预结(决)算的审计服务合同。与丙装修中标单位签订的精装修合同中写明监理单位为甲监理公司。但在另一条款中又规定:精装修工程预付款、工程款及工程结算必须经乙审计事务所审查签字同意后方可付款。在精装修施工中,建设单位要求甲监理公...
【单选题】下列不属于生产与运作管理的基本问题的是( )
A.
产出要素管理
B.
资源要素管理
C.
生产要素管理
D.
环境要素管理
【多选题】下列哪个参数的值越小,表示变形程度越大
A.
拉深系数
B.
相对弯曲半径
C.
缩口系数
D.
胀形系数
【单选题】输血相关疾病检测实验室的建筑与设施应符合《实验室生物安全通用要求》和《微生物和生物医学实验室生物安全通用准则》中的规定。根据实验室的检测流程和检测项目实验室应分设检测作业区,关于检验作业区的描述正确的是()
A.
实验区域只需包括样本接收和检测区。不同类型检测项目作业区,应采取措施防止交叉污染
B.
实验区域至少包括样本接收、处理和储存区,试剂储存区,检测区。不同类型检测项目作业区,应采取措施防止交叉污染
C.
不同类型检测项目作业区,无需采取措施防止交叉污染
D.
员工休息区与作业区可合用
E.
实验区域内的产生的废物一律按医疗废物处理
【判断题】品种、成本、交货期这三个生产运作管理的基本问题的优先地位是随时间和企业的战略而变化的。
A.
正确
B.
错误
【单选题】图形中尺寸标注错误之处有:【图片】
A.
2处
B.
3处
C.
4处
D.
5处
【判断题】质量、成本、交货期这三个生产运作管理的基本问题的优先地位是随时间和企业的战略而变化的。()
A.
正确
B.
错误
【单选题】图形中尺寸标注错误之处有( )处
A.
2
B.
3
C.
4
D.
5
相关题目: