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问题 选择题

如图.在Rt△ABC中，∠A=30 °，DE垂直平分斜边AC，交AB于D，E式垂足，连接CD，若BD=1，则AC的长是    

[ ]

A.2    

B.2      

C.4        

D.4

答案

答案：A

问答题

As a scourge of the modern society, obesity has become the world’s biggest public-health issue today — the main cause of heart disease, which kills more people these days than AIDS, malaria, war. Since the World Health Organization labeled obesity an "epidemic" in 2000, reports on its fearful consequences have come thick and fast. Will public-health warnings, combined with media pressure, persuade people to get thinner, just as they finally put them off tobacco Possibly. In the rich world, sales of healthier foods are booming and new figures suggest that over the past year Americans got very slightly thinner for the first time in recorded history. But even if Americans are losing a few ounces, it will be many years before the country solves the health problems caused by half a century’s dining to excess. And, everywhere else in the world, people are still piling on the pounds. That’s why there is now a consensus among doctors that governments should do something to stop them.
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单项选择题

个人住房贷款的信用风险通常是因借款人的（）和（）下降导致的。

A.担保品价值；保证人实力

B.还款意愿；担保品价值

C.还款能力；还款意愿

D.还款能力；担保品价值
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