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中科合资广东炼化一体化项目于2011年3月4日正式获得国家发改委核准。项目核准对湛江打造石化产业基地、促进区域经济协调发展意义重大，为湛江争当粤西地区振兴发展龙头奠定了坚实基础。为减少大气和水源的污染，必须加强对基地的工业废气和废水的治理。根据所学化学知识回答下列问题： （1）石油属于____________能源（填“可再生”或“不可再生”）。 （2）酸雨是指pH_______5.6（填“>”、“（3）天然气(主要成分是甲烷)是石油化工生产的产品之一，可做环保汽车的燃料，它完全燃烧的化学方程式是__________________。 （4）请你向石化产业基地领导提出保护水资源的一条建议______________。
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【单选题】Since the 1950's, literary critics have attempted to answer the question: When did children's literature first emerge as a distinct literary genre?
A.
improve
B.
appear
C.
conform
D.
respond
【简答题】Singing had always been an important part of Gloria Estefan’s life. “Since I was three years old, I sang. I sang everything,” Gloria said. “Cubans,” she added, “are a musical people”. Gloria was born ...
【简答题】Singing had always been an important part of Gloria Estefan’s life. “ Since I was three years old, I sang. I sang everything,” Gloria said. “Gubans,” she added, “are a musical people.” Gloria was born...
【单选题】The happy student was singing ____ he was going home. [ ]
A.
until
B.
as
C.
since
D.
and
【单选题】The following statements are true about the loss of the Arctic ice EXCEPT that ______
A.
the loss of the Arctic ice will affect both animals living there and all human beings
B.
the loss of the Arctic ice will make us feel warm in summer and cold in winter
C.
the Greenland Ice Sheet will melt and lose mass
D.
the Arctic ecosystem will become disordered
【简答题】已知函数f（x）= lo g 2 1+x 1-x ． （1）求函数f（x）的定义域； （2）判断函数f（x）的奇偶性，并证明； （3）判断函数f（x）在定义域上的单调性，并用定义证明．
【简答题】英汉互译。 1. listen to __________ 4. 关掉 __________ 2. turn up __________ 5. 中国音乐 __________ 3. turn on __________ 6. 另一个节目 __________
【简答题】forms slowly beneath other types of ice __________
【简答题】I’m good at singing. I’ve been interested in music and dreamed of become a singer ever since my childhood. My parents began to teach me children’s songs until I was only three. After I started school ...
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