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先张法是在浇筑混凝土之前张拉预应力筋。（）

A. 对
B. 错

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U1R1 P1:Droughts and forest fires have been occurring dramatically more often in the past century.近百年来，干旱和森林火灾的爆发愈加频繁。U1R4 P1:Forecasting climate change is extremely difficult, but the evidence is now irrefutable: human activities are driving the current period of global warming.气候变化难以预测，但证据却是无可辩驳的存在：人类活动正在推动当前的全球变暖现象。There are many predictions, but : (不可辩驳的事实是：干旱比起往年频繁出现)

U1R4 P1:The dispute lies in whether or not the warming we are now experiencing simply reflects a natural change in the recent global temperature trend or results from the polluting impact of human activities since the industrial revolution.争议在于，我们正在经历的变暖是否仅仅反映了最近全球温度的自然变化，抑或是工业革命以来人类活动导致的结果。U1R4 P3:What is certain is that our children and their descendants are going to find the Earth a very different place.可以肯定的是我们的孩子和他们的后代将认识一个不同的地球。We are not sure where the controversy lead, but it . (唯一能够确定的是这反映了人们思想的改变)

U1R4 P1:In spite of a few scientists, oil company supporters, and the president of the world's greatest polluter, the overwhelming consensus is that without a reduction in greenhouse gas emissions things are going to get very bad indeed.尽管一些科学家，支持石油公司者和世界上最大污染国的总统持有不同意见，但广泛的认同是，如果没有温室气体减排，情况确实会很糟糕。U1R4 P2:Prospects look bleak indeed.前景确实堪忧。Although the government has taken various measures in the financial crisis, (绝大多数人普遍认为) (前景依然非常惨淡).

U1R1 P4:Aside from natural and health issues, the world's economy is also at risk.除了自然和健康问题，全球经济也面临危险。U1R4 P1: There is absolutely no question that the Earth is warming up fast, and few climate scientists would argue with this.毫无疑问，地球温度急速上升，气候学科学家也一致认可。（毫无疑问）if the global eco-system collapses, . (世界经济也会面临危机)