英语翻译
题目
英语翻译
Human beings need to drink for their survival.Water ranks __high__on the list of all-time safe fluids.But not all water is as safe as once __thought__.Recent tests of water fountains in several U.S.cities show that many fountains give water containing large __amounts__of lead(Pb),a poisonous metal.A recent study of 900 water fountains in Los Angeles _revealed___that half of the fountains __tested__contained higher amounts of lead than the _amount___the experts
consider __safe__.In other cities __similar__results of tests were announced:too much lead in many,though ___not all_,drinking fountains. Water doesn‘t normally contain any lead,but when it passes through pipes,it can __be contaminated__. People who drink the water __take in__the lead. An adult‘s body passes most of the lead__out of__the body,but children‘s __body__retains more than half the lead __swallowed__.This makes children more likely to be affected.Lead
can damage the kidneys ,cause __hearing loss__and
答案
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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