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【简答题】
Rivers are the veins of the Earth, transporting the water and nutrients ( 营养物 ) needed to support the planet’s ecosystems, including human life. While many nutrients are essential to the survival of life, there is one element transported by water in rivers that holds the key to life and to the future of our planet — carbon. Carbon is everywhere and understanding the way it moves and is either released or stored by the Earth system is a complex science in itself. Carbon starts its journey downstream when natural acid rain, which contains carbon dioxide from the atmosphere, melts minerals in rocks. This helps transform carbon dioxide to bicarbonate ( 碳酸氢盐 ) in the water that then flows in our rivers. This is a very long process, which is one of the main ways carbon dioxide is removed from the atmosphere. Carbon is transported by rivers to oceans and once that carbon reaches the ocean, it is stored naturally in deep sea sediments ( 沉淀物 ) for millions of years. As carbon travels down a river, different processes may impact whether it continues to flow downstream or whether it is released into the atmosphere. For example, human engineering, like extensive dam construction, will result in dramatic changes to how water and sediments travel down the river. Some carbon that fails to reach the sea may return to the atmosphere in some way, which causes more warming. Earth’s climate is closely related to the carbon cycle. We all know about the essential role of plants in consuming carbon dioxide, but do we know enough about rivers? Changing the chemistry and the course of rivers may have significant impacts on how they transport carbon. Remember: wherever we live, we all live downstream.
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A.
正确
B.
错误
【单选题】The nine peaches and bats have the symbolic meaning of happiness, longevity and ________.
A.
prosperity
B.
peace
C.
hope
D.
healthy
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A.
交易所可以根据不同的期货品种的具体情况,分别确定每一品种的限仓数额
B.
套期保值交易头寸的持仓不受限制
C.
同一客户在不同期货公司会员处开仓交易,其在某一合约的持仓合计不得超出该客户的持仓限额
D.
会员、客户持仓达到或者超过持仓限额的,可以同方向开仓交易
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A.
个人理想和社会理想的关系
B.
职业理想和道德理想的关系
C.
阶段性理想和最终理想的关系
D.
有实现可能性的理想和根本不可能实现的空想的关系
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A.
一次设备
B.
二次设备
C.
能量转换设备
D.
开关设备
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A.
No one can find the Spanish department.
B.
He helps people find the Spanish department.
C.
His family lives in the apartment building
D.
He has no idea where to find the Spanish department.
【单选题】下列关于持仓限额的说法,不正确的是( )。
A.
交易所可以根据不同期货品种的具体情况,分别确定每一品种的限仓数额
B.
套期保值交易头寸的持仓不受限制
C.
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D.
会员、客户持仓达到但未超过持仓限额的,可以同方向开仓交易
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A.
交易所可以根据不同期货品种的具体情况,分别确定每一品种每一月份的限仓数额
B.
套期保值和套利交易的持仓均不受限制
C.
同一客户在不同期货公司会员处开仓交易,其在某一合约的持仓合计不得超出该客户的持仓限额
D.
会员、客户持仓达到或者超过持仓限额的,可以同方向开仓交易
【简答题】Fill in the blanks according to what you hear in the movie clip. We do, if we want to hit a homerun, sweet heart. Now, I've read 1) ________ to the West in English, the book this character chosed from...
【多选题】绝缘防护手套出现以下哪些情况时禁止使用( )
A.
表面有裂痕
B.
表面发粘
C.
表面发脆
D.
表面正常
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